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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 14 — Jul. 2, 2012
  • pp: 15015–15023
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Bragg reflection waveguide as a source of wavelength-multiplexed polarization-entangled photon pairs

Jiří Svozilík, Martin Hendrych, and Juan P. Torres  »View Author Affiliations


Optics Express, Vol. 20, Issue 14, pp. 15015-15023 (2012)
http://dx.doi.org/10.1364/OE.20.015015


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Abstract

We put forward a new highly efficient source of paired photons entangled in polarization with an ultra-large bandwidth. The photons are generated by means of a conveniently designed spontaneous parametric down-conversion process in a semiconductor type-II Bragg reflection waveguide. The proposed scheme aims at being a key element of an integrated source of polarization-entangled photon pairs highly suitable for its use in a multi-user quantum-key-distribution system.

© 2012 OSA

1. Introduction

The polarization degree of freedom is the most widely used resource to generate entanglement between two distant parties. Polarization-entangled photons can be generated by means of spontaneous parametric down-conversion (SPDC), a nonlinear optical process in which two lower-frequency photons (signal and idler) are generated when a strong pump interacts with the atoms of a nonlinear material. Subsequently to the generation, each photon constituting a pair can propagate through a different single-mode fiber, with the initial degree of entanglement between the photons being preserved over long distances [8

8. H. Hubel, M. R. Vanner, T. Lederer, B. Blauensteiner, T. Lorunser, A. Poppe, and A. Zeilinger, “High-fidelity transmission of polarization encoded qubits from an entangled source over 100 km of fiber,” Opt. Express 15, 7853–7862 (2007). [CrossRef] [PubMed]

].

One application that is attracting a lot of interest due its potential key role in the newly emerging quantum communication networks is the multi-user quantum key distribution (QKD) [9

9. T. E. Chapuran, P. Toliver, N. A. Peters, J. Jackel, M. S. Goodman, R. J. Runser, S. R. McNown, N. Dallmann, R. J. Hughes, K. P. McCabe, J. E. Nordholt, C. G. Peterson, K. T. Tyagi, L. Mercer, and H. Dardy, “Optical networking for quantum key distribution and quantum communications,” New J. Phys. 11, 105001 (2009). [CrossRef]

]. In order to implement a multi-user QKD network, various frequency channels can expediently be employed for transmitting individual entangled pairs. In this way, one can re-route on demand specific channels between users located in different sites of the optical network. Similar schemes, considering the emission of photon pairs in different spectral and spatial modes, have been presented in [10

10. A. L. Migdall, D. Branning, and S. Castelletto, “Tailoring single-photon and multiphoton probabilities of a single-photon on-demand source,” Phys. Rev. A 66, 053805 (2002). [CrossRef]

, 11

11. J. H. Shapiro and F. N. Wong, “On-demand single-photon generation using a modular array of parametric down-converters with electro-optic polarization controls,” Opt. Lett. 32, 2698–2700 (2007). [CrossRef] [PubMed]

] for an on-demand single-photon source based on a single crystal.

To prepare polarization-entangled paired photons in many frequency channels at the same time, one needs to engineer an SPDC process with an ultra-broad spectrum. Usually type-I or type-0 configurations are preferred. With the type-II phase-matching, the two down-converted photons have different polarizations and consequently different group velocities, which reduces dramatically their bandwidth. For instance, the FWHM bandwidth of an SPDC process in a type-II periodically-poled (PP) KTP crystal at 810 nm is given by Δλ (nm) = 5.52/L(mm), where L is the length of the crystal [12

12. A. Fedrizzi, T. Herbst, A. Poppe, T. Jennewein, and A. Zeilinger, “A wavelength-tunable fiber-coupled source of narrowband entangled photons,” Opt. Express 15, 15377–15386 (2007). [CrossRef] [PubMed]

]. For L = 1 mm, the bandwidth is Δλ ∼ 5.5 nm. On the other hand, in a type-0 PPLN configuration with the same crystal length L = 1 mm, Lim et al. [13

13. H. C. Lim, A. Yoshizawa, H. Tsuchida, and K. Kikuchi, “Wavelength-multiplexed distribution of highly entangled photon-pairs over optical fiber,” Opt. Express 26, 22099–22104 (2008). [CrossRef]

] achieved an approximate tenfold increase of the bandwidth Δλ ∼ 50 nm. Even though one can always reduce the length of the nonlinear crystal in a type-II configuration to achieve an increase of the bandwidth, this results in a reduction of the spectral brightness of the source.

Alternatively to short bulk crystals, Bragg reflection waveguides (BRWs) based on III–V ternary semiconductor alloys (AlxGa1−xAs) offer the possibility to generate polarization-entangled photons with an ultra-large bandwidth. The most striking feature of the use of BRW as a photon source is the capability of controlling the dispersive properties of all interacting waves in the SPDC process, which in turn allows the tailoring of the bandwidth of the down-converted photons: from narrowband (1 – 2 nm) to ultra-broadband (hundreds of nm) [14

14. P. Abolghasem, J. Han, B. J. Bijlani, A. Arjmand, and A. S. Helmy, “Continuous-wave second harmonic generation in Bragg reflection waveguides,” Opt. Lett. 34, 9460–9467 (2009).

16

16. D. Kang and A. S. Helmy, “Generation of polarization entangled photons using concurrent type-I and type-0 processes in AlGaAs ridge waveguides,” Opt. Lett. 37, 1481–1483 (2012). [CrossRef] [PubMed]

], considering both type-I and type-II configurations. Therefore, one can design a type-II SPDC process in BRWs with a bandwidth typical for type-I or type-0 processes.

The utilization of Bragg reflection waveguide (BRW) has further advantages over other conventional SPDC sources due to the large nonlinear coefficient of semiconductors ( deffGaAs~119 pm/V) [17

17. I. Shoji, T. Kondo, A. Kitamoto, M. Shirane, and R. Ito, “Absolute scale of second-order nonlinear-optical coefficients,” J. Opt. Soc. Am. B 14, 2268–2294 (1997). [CrossRef]

], broad transparency window (0.9 – 17μm) and mature fabrication technologies that can be used for integration of the source of entangled photons with a light source and other optical elements. Additionally, a laser based on BRWs has already been demonstrated [18

18. B. J. Bijlani and A. S. Helmy, “Bragg reflection waveguide diode lasers,” Opt. Lett. 34, 3734–3736 (2009). [CrossRef] [PubMed]

], opening a door for the integration in a single chip of the pump light source together with the BRW, where the down-converted photons are generated [19

19. R. Horn, P. Abolghasem, B. J. Bijlani, D. Kang, A. S. Helmy, and G. Weihs, “Monolithic source of photon pairs,” Phys. Rev. Lett. 108, 153605 (2012). [CrossRef] [PubMed]

].

2. Description of the quantum state of the down-converted photons

In order to investigate the potential of the proposed design for generating wavelength-multiplexed polarization-entangled photon pairs over many frequency channels, let us examine the biphoton generation in a collinear type-II phase-matching scheme in the Bragg reflection waveguide (see Fig. 1). A continuous-wave TM-polarized pump beam with frequency ωp illuminates the waveguide and mediates the generation of a pair of photons with mutually orthogonal polarizations (signal: TE polarization; idler: TM polarization). The frequencies of the signal and idler photons are ωs = ω0 + Ω and ωi = ω0 − Ω, respectively, where ω0 is the degenerate central angular frequency of both photons, and Ω is the angular frequency deviation from the central frequency. The signal photon (TE) propagates as a TIR mode of the waveguide with spatial shape Us(x, y, ωs) and propagation constant βs(ωs). The idler photon (TM), also a TIR mode, has a spatial shape Ui(x, y, ωi) and propagation constant βi(ωi). The pump beam is a Bragg mode of the waveguide with spatial shape Up(x, y, ωp) and propagation constant βp(ωi).

Fig. 1 General scheme for the generation of polarization-entangled photon pairs in various frequency channels by making use of the Bragg reflection waveguide. In this scheme, a dichroic mirror or a grating can be used as the wavelength demultiplexer.

At the output face of the nonlinear waveguide, the quantum state of the biphoton can be written as [21

21. J. P. Torres, K. Banaszek, and I. A. Walmsley, “Engineering nonlinear optic sources of photonic entanglement,” Prog. Opt. 56, 227–331 (2011). [CrossRef]

]
|Ψ1=|vacs|vaci+σLFp1/2dΩΦ(Ω)|TE,ω0+Ωs|TM,ω0Ωi,
(1)
where the nonlinear coefficient σ is defined
σ=[h¯ω02ωp[χ(2)]2Γ216πε0c3ns(ω0)ni(ω0)np(ωp)]1/2.
(2)
Fp is the flux rate of pump photons, Γ=drUp(r)Us*(r)Ui*(r) is the overlap integral of the spatial modes of all interacting waves in the transverse plane, and np,s,i are their refractive indices. The joint spectral amplitude Φ(Ω) has the form
Φ(Ω)=sinc[Δk(Ω)L/2]exp{isk(Ω)L/2}.
(3)
The ket |TE, ω0 + Ω〉s (|TM, ω0 − Ω〉i) designates a signal (idler) photon that propagates with polarization TE (TM) in a mode of the waveguide with the spatial shape Us (Ui) and frequency ω0 + Ω (ω0 − Ω). The phase-mismatch function reads Δk(Ω) = βpβs(Ω) − βi(−Ω), and sk(Ω) = βp + βs(Ω) +βi(−Ω). The function |Φ(Ω)|2 is proportional to the probability of detection of a photon with polarization TE and frequency ω0 + Ω in coincidence with a photon with TM polarization and frequency ω0 − Ω.

After the waveguide, a wavelength demultiplexer is used to separate all n frequency channels into coupled fibers leading to the users of the network. The bandwidth of each channel is Δω and their central frequencies are ωU,Ln=ω0±nΔ, where Δ is the inter-channel frequency spacing and the letter U(L) indicates the upper (lower) path (see Fig. 1). After the demultiplexer, the quantum state of the down-converted photons can be written as
|Ψ2=|vacs|vaci+1/2σLFp1/2BndΩ{Φ(Ω)|TE,ω0+ΩU|TM,ω0ΩL+Φ(Ω)|TM,ω0+ΩU|TE,ω0ΩL},
(4)
where ∫Bn designates the frequency bandwidth from ωU,LnΔω/2 to ωU,Ln+Δω/2 coupled into every single fiber. Since we are interested in generating polarization-entangled paired photons coupled into single-mode fibers, the signal and idler photons in the upper and lower paths are projected into the fundamental mode (U0) of the fiber. The coupling efficiency between the signal and idler modes, and the fundamental mode of the single-mode fiber are given by Γs=|dxdyUs(x,y,ωs)U0*(x,y,ω0)|2 and Γi=|dxdyUi(x,y,ωi)U0*(x,y,ω0)|2. They yield a value of Γs = Γi ≈ 0.88 in the whole bandwidth of interest, showing a minimal frequency dependence. All the modes are normalized so that ∫ dxdy|Uj(x, y, ω)|2 = 1 for j = s, i, 0.

Neglecting the vacuum contribution in the final quantum state, normalizing and tracing out the frequency degree of freedom, the two-photon state can be represented by the following density matrix, where we use the conventional ordering of rows and columns as {|TE〉U |TE〉L, |TE〉U |TM〉L, |TM〉U |TE〉L, |TM〉U |TM〉L}:
ρn=(00000αnγn00γn*βn00000),
(5)
where
αn=1/2BndΩ|Φ(Ω)|2,βn=1/2BndΩ|Φ(Ω)|2,γn=1/2BndΩΦ(Ω)Φ*(Ω),
(6)
with Tr[ρn] = αn +βn = 1.

3. Numerical results

In the waveguide structure considered, the pump wavelength is 775.1 nm. The frequency spacing between channels is Δ = 50 GHz and the bandwidth of each channel is 50 GHz, which corresponds approximately to 0.4 nm at 1550 nm. The channel width and the spacing between channels were chosen according to the typical values used in commercial WDM systems. Channel n = 1 corresponds to the wavelength 1549.6 nm in the upper path and to 1550.6 nm in the lower path.

In order to reach a high number of frequency channels, the BRW structure must be designed in such way, so as to permit the generation of signal-idler pairs with an ultra-broad spectrum in the type-II configuration. This is achieved when the group velocities of the TE and TM modes are equal [22

22. S. V. Zhukovsky, L. G. Helt, D. Kang, P. Abolghasem, A. S. Helmy, and J. E. Sipe, “Generation of maximally-polarization-entangled photons on a chip,” Phys. Rev. A 85, 013838 (2012). [CrossRef]

,23

23. J. P. Torres, M. Hendrych, and A. Valencia, “Angular dispersion: an enabling tool in nonlinear and quantum optics,” Adv. Opt. Photon. 2, 319–369 (2010). [CrossRef]

], i.e., |βsΩβiΩ|0. The modes of the structure and its propagation constants are obtained as a numerical solution of the Maxwell equations inside the waveguide using the finite element method [24

24. J. Jin, The Finite Element Method in Electromagnetics, 2nd ed. (Wiley-IEEE Press, 2002).

]. The waveguide design has been optimized by a genetic algorithm according to the requirements. The final BRW design is composed of two Bragg reflectors, one placed above and one below the core. Each reflector contains 8 bi-layers. The Sellmeier equations for the refractive indices of the layers were taken from [25

25. S. Gehrsitz, F. K. Reinhart, C. Gourgon, N. Herres, A. Vonlanthan, and H. Sigg, “The refractive index of Al(x)Ga(1–x)As below the band gap: accurate determination and empirical modeling,” J. Appl. Phys. 87, 7825–7837 (2000). [CrossRef]

]. Table 1 summarizes the main parameters of the structure.

Table 1. (a) Parameters of the structure: tc - core thickness; t1,2 - thicknesses of the alternating layers of the Bragg reflector; xc - aluminium concentration in the core; x1,2 - aluminium concentrations in the reflector’s layers; nc - the refractive index in the core; n1,2 - refractive indices in the reflector’s layers; ∂βs(i)/Ω-the inverse group velocity of the signal (idler) photon. The structure is optimized for the collinear type-II SPDC. (b) Profile of the refractive index along the y-axis of the BRW.

table-icon
View This Table

Fig. 2 Joint spectral intensity ∼ |Φ(λ)|2 of the biphoton generated in the Bragg reflection waveguide for type-II phase-matching (TM → TE + TM).

The degree of entanglement in each spectral channel can be quantified by calculating the concurrence Cn of the biphoton [27

27. S. Hill and W. K. Wootters, “Entanglement of a pair of quantum bits,” Phys. Rev. Lett. 78, 5022–5025 (1997). [CrossRef]

,28

28. K. Wootters, “Entanglement of formation of an arbitrary state of two qubits,” Phys. Rev. Lett. 80, 2245–2248 (1998). [CrossRef]

]. The concurrence is equal to 0 for a separable state and to 1 for a maximally entangled state. For the density matrix of Eq. (5) we obtain [29

29. T. Yu and J. H. Eberly, “Quantum open system theory: bipartite aspects,” Phys. Rev. Lett. 97, 140403 (2006). [CrossRef] [PubMed]

]
Cn=2|γn|,
(7)
so the degree of entanglement depends on the symmetry of the spectral amplitude Φ (Ω), i.e., if Φ (Ω) = Φ (−Ω) the concurrence is maximum.

Figure 3 shows the values of αn, βn and Cn for the first 200 channels. Cn > 0.9 is reached for the first 179 channels. The decrease (increase) of the parameters βn (αn) reflects the fact that for frequency channels with a large detuning from the central frequency, one of the two polarization components of the polarization entangled state, |TE〉1 |TM〉2 or |TM〉1 |TE〉2, shows a greater amplitude probability. In this case, one of the two options predominates. Therefore, if the goal is to generate a quantum state of the form |Ψ2=1/2 (|TE〉1 |TM〉2 + |TM〉1 |TE〉2) in a specific frequency channel with αn, βn ≠ 1/2, one can always modify the diagonal elements of the density matrix with a linear transformation optical system, keeping unaltered the degree of entanglement.

Fig. 3 Coefficients Cn (solid line), αn (dashed line) and βn(dotted-and-dashed line) as a function of the frequency channel.

The number of frequency channels available depends on the concurrence required for the specific application. A good example is a linear optical gate relying on the interference of photons on a beam splitter [30

30. Y Kim and W. P. Grice, “Reliability of the beam-splitterbased Bell-state measurement,” Phys. Rev. A 68, 062305 (2003). [CrossRef]

, 31

31. P. P. Rohde and T. C. Ralph, “Frequency and temporal effects in linear optical quantum computing,” Phys. Rev. A 71, 032320 (2005). [CrossRef]

]. This would be especially important for the implementation of quantum teleportation, where the fidelity of the protocol depends strongly on the spectral indistinguishably between polarizations of the entangled state [7

7. T. S. Humble and W. P. Grice, “Spectral effects in quantum teleportation,” Phys. Rev. A 75, 022307 (2007). [CrossRef]

]. In Fig. 4 we plot the number of frequency channels available as a function of the minimum concurrence required. For instance, if we select only frequency channels with Cn > 0.95, we have at our disposal 162 channels, while for Cn > 0.99 this number is reduced to 121 channels.

Fig. 4 Number of channels available as a function of the minimum value of the concurrence required.

In the implementation of the system considered here in a real fiber-optics network, the number of frequency channels available can be limited by several factors. For instance, it can be limited by the operational bandwidth of the demultiplexer (see Fig. 1). This device should be designed to operate with the same broad spectral range of the photon pairs generated in the BRW waveguide.

When using a large number of channels, inspection of Fig. 2 shows that channels far apart from the central frequency will exhibit a lower brightness. In this case, spectral shapers or appropriately designed filters, should be used to flatten the emission spectrum, similarly to the case of broadband gain-flattened Erbium doped fiber amplifiers (EDFA). Notwithstanding, this might introduce some losses in the generation process, especially when considering a large number of channels, deteriorating the flux rate of the source. Interestingly, a similar problem appears in the context of optical coherence tomography (OCT), where large bandwidths are required to increase the imaging resolution. In OCT, spectral shapers are used to obtain an optimum (Gaussian-like) spectral shape [32

32. W. Drexler, “Ultrahigh-resolution optical coherence tomography,” J. Biomed. Opt. 9, 47–74 (2004). [CrossRef] [PubMed]

].

Finally, we should mention that the generation of polarization-entangled photons with the large bandwidths considered here require a precise control the group velocities of the interacting waves, which in turn requires a precise control of the waveguide parameters: refractive index and layer widths. The effective number of available frequency channels in a specific application is inevitably linked to the degree of control of the fabrication process. Since both down-converted photons are propagating as TIR modes, they are more resistant to fabrication imperfections. For example, a change of about 10% in the aluminium concentration in the core will reduce the spectral bandwidth to 145 nm. Notwithstanding, it has to be stressed that the phase-matching condition for interacting waves is highly sensitive to any fabrication imperfection, therefore any small change of the structural parameters will lead to a shift of the central (phase-matched) wavelength.

4. Conclusion

In conclusion, we have presented a new type of highly efficient waveguide source for generating polarization-entangled photon pairs for its use in multi-frequency QKD networks. In spite of being a type-II SPDC source, the achieved bandwidth is even larger than the bandwidth usually obtained with type-I or type-0 sources. The key enabling factor that allows us to achieve high efficiency of the nonlinear process together with a bandwidth increase is the fact that we can use a longer nonlinear material in a type-II configuration, while at the same time keeping the broadband nature of the SPDC process through the appropriate design of the Bragg reflection waveguide structure.

Even though conventional sources based on the use of more common nonlinear materials, such as KTP or LiNbO3, might also generate entangled pairs of photons with a large bandwidth, BRWs based on AlGaAs compounds offer two main advantages: an enhanced capability to tailor the general properties of the downconverted photons, and the possibility of integration of different elements (pump source, nonlinear waveguide and diverse optical elements) in a chip platform based on an already mature technology, which could pave the way for entanglement-based technologies in out-of-the-lab scenarios.

Acknowledgments

This work was supported by Project FIS2010-14831 and FET-Open 255914 (PHORBITECH). J. S. thanks the project FI-DGR 2011 of the Catalan Government. This work has also supported in part by projects COST OC 09026, CZ.1.05/2.1.00/03.0058 of the Ministry of Education, Youth and Sports of the Czech Republic and by projects PrF-2011-009 and PrF-2012-003 of Palacký University.

References and links

1.

A. Serafini, S. Mancini, and S. Bose, “Distributed quantum computation via optical fibers,” Phys. Rev. Lett. 96, 010503 (2006). [CrossRef] [PubMed]

2.

J. I. Cirac, A. K. Ekert, S. F. Huelga, and C. Macchiavello, “Distributed quantum computation over noisy channels,” Phys. Rev. A 59, 4249–4254 (1999). [CrossRef]

3.

G. Ribordy, J. Brendel, J. Gautier, N. Gisin, and H. Zbinden, “Long-distance entanglement-based quantum key distribution,” Phys. Rev. A 63, 012309 (2000). [CrossRef]

4.

A. K. Ekert, “Quantum cryptography based on Bell’s theorem,” Phys. Rev. Lett. 67, 661–663 (1991). [CrossRef] [PubMed]

5.

M. Hillery, V. Bužek, and A. Berthiaume, “Quantum secret sharing,” Phys. Rev. A 59, 1829–1834 (1999). [CrossRef]

6.

C. H. Bennett, G. Brassard, C. Crepeau, R. Jozsa, A. Peres, and W. K. Wootters, “Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels,” Phys. Rev. Lett. 70, 1895–1899 (1993). [CrossRef] [PubMed]

7.

T. S. Humble and W. P. Grice, “Spectral effects in quantum teleportation,” Phys. Rev. A 75, 022307 (2007). [CrossRef]

8.

H. Hubel, M. R. Vanner, T. Lederer, B. Blauensteiner, T. Lorunser, A. Poppe, and A. Zeilinger, “High-fidelity transmission of polarization encoded qubits from an entangled source over 100 km of fiber,” Opt. Express 15, 7853–7862 (2007). [CrossRef] [PubMed]

9.

T. E. Chapuran, P. Toliver, N. A. Peters, J. Jackel, M. S. Goodman, R. J. Runser, S. R. McNown, N. Dallmann, R. J. Hughes, K. P. McCabe, J. E. Nordholt, C. G. Peterson, K. T. Tyagi, L. Mercer, and H. Dardy, “Optical networking for quantum key distribution and quantum communications,” New J. Phys. 11, 105001 (2009). [CrossRef]

10.

A. L. Migdall, D. Branning, and S. Castelletto, “Tailoring single-photon and multiphoton probabilities of a single-photon on-demand source,” Phys. Rev. A 66, 053805 (2002). [CrossRef]

11.

J. H. Shapiro and F. N. Wong, “On-demand single-photon generation using a modular array of parametric down-converters with electro-optic polarization controls,” Opt. Lett. 32, 2698–2700 (2007). [CrossRef] [PubMed]

12.

A. Fedrizzi, T. Herbst, A. Poppe, T. Jennewein, and A. Zeilinger, “A wavelength-tunable fiber-coupled source of narrowband entangled photons,” Opt. Express 15, 15377–15386 (2007). [CrossRef] [PubMed]

13.

H. C. Lim, A. Yoshizawa, H. Tsuchida, and K. Kikuchi, “Wavelength-multiplexed distribution of highly entangled photon-pairs over optical fiber,” Opt. Express 26, 22099–22104 (2008). [CrossRef]

14.

P. Abolghasem, J. Han, B. J. Bijlani, A. Arjmand, and A. S. Helmy, “Continuous-wave second harmonic generation in Bragg reflection waveguides,” Opt. Lett. 34, 9460–9467 (2009).

15.

K. Thyagarajan, R. Das, O. Alibart, M. Micheli, D. B. Ostrowsky, and S. Tanzilli, “Increased pump acceptance bandwidth in spontaneous parametric downconversion process using Bragg reflection waveguides,” Opt. Express 16, 3577–3582 (2008). [CrossRef] [PubMed]

16.

D. Kang and A. S. Helmy, “Generation of polarization entangled photons using concurrent type-I and type-0 processes in AlGaAs ridge waveguides,” Opt. Lett. 37, 1481–1483 (2012). [CrossRef] [PubMed]

17.

I. Shoji, T. Kondo, A. Kitamoto, M. Shirane, and R. Ito, “Absolute scale of second-order nonlinear-optical coefficients,” J. Opt. Soc. Am. B 14, 2268–2294 (1997). [CrossRef]

18.

B. J. Bijlani and A. S. Helmy, “Bragg reflection waveguide diode lasers,” Opt. Lett. 34, 3734–3736 (2009). [CrossRef] [PubMed]

19.

R. Horn, P. Abolghasem, B. J. Bijlani, D. Kang, A. S. Helmy, and G. Weihs, “Monolithic source of photon pairs,” Phys. Rev. Lett. 108, 153605 (2012). [CrossRef] [PubMed]

20.

A. S. Helmy, B. Bijlani, and P. Abolghasem, “Phase matching in monolithic Bragg reflection waveguides,” Opt. Lett. 32, 2399–2401 (2007). [CrossRef] [PubMed]

21.

J. P. Torres, K. Banaszek, and I. A. Walmsley, “Engineering nonlinear optic sources of photonic entanglement,” Prog. Opt. 56, 227–331 (2011). [CrossRef]

22.

S. V. Zhukovsky, L. G. Helt, D. Kang, P. Abolghasem, A. S. Helmy, and J. E. Sipe, “Generation of maximally-polarization-entangled photons on a chip,” Phys. Rev. A 85, 013838 (2012). [CrossRef]

23.

J. P. Torres, M. Hendrych, and A. Valencia, “Angular dispersion: an enabling tool in nonlinear and quantum optics,” Adv. Opt. Photon. 2, 319–369 (2010). [CrossRef]

24.

J. Jin, The Finite Element Method in Electromagnetics, 2nd ed. (Wiley-IEEE Press, 2002).

25.

S. Gehrsitz, F. K. Reinhart, C. Gourgon, N. Herres, A. Vonlanthan, and H. Sigg, “The refractive index of Al(x)Ga(1–x)As below the band gap: accurate determination and empirical modeling,” J. Appl. Phys. 87, 7825–7837 (2000). [CrossRef]

26.

A. Ling, A. Lamas-Linares, and C. Kurtsiefer, “Absolute emission rates of spontaneous parametric down-conversion into single transverse Gaussian modes,” Phys. Rev. A 77, 043834 (2008). [CrossRef]

27.

S. Hill and W. K. Wootters, “Entanglement of a pair of quantum bits,” Phys. Rev. Lett. 78, 5022–5025 (1997). [CrossRef]

28.

K. Wootters, “Entanglement of formation of an arbitrary state of two qubits,” Phys. Rev. Lett. 80, 2245–2248 (1998). [CrossRef]

29.

T. Yu and J. H. Eberly, “Quantum open system theory: bipartite aspects,” Phys. Rev. Lett. 97, 140403 (2006). [CrossRef] [PubMed]

30.

Y Kim and W. P. Grice, “Reliability of the beam-splitterbased Bell-state measurement,” Phys. Rev. A 68, 062305 (2003). [CrossRef]

31.

P. P. Rohde and T. C. Ralph, “Frequency and temporal effects in linear optical quantum computing,” Phys. Rev. A 71, 032320 (2005). [CrossRef]

32.

W. Drexler, “Ultrahigh-resolution optical coherence tomography,” J. Biomed. Opt. 9, 47–74 (2004). [CrossRef] [PubMed]

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(270.0270) Quantum optics : Quantum optics

ToC Category:
Quantum Optics

History
Original Manuscript: April 12, 2012
Revised Manuscript: June 6, 2012
Manuscript Accepted: June 6, 2012
Published: June 20, 2012

Citation
Jiří Svozilík, Martin Hendrych, and Juan P. Torres, "Bragg reflection waveguide as a source of wavelength-multiplexed polarization-entangled photon pairs," Opt. Express 20, 15015-15023 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-14-15015


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References

  1. A. Serafini, S. Mancini, and S. Bose, “Distributed quantum computation via optical fibers,” Phys. Rev. Lett.96, 010503 (2006). [CrossRef] [PubMed]
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