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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 19 — Sep. 13, 2010
  • pp: 20475–20490

Modal and polarization qubits in Ti:LiNbO3 photonic circuits for a universal quantum logic gate

Mohammed F. Saleh, Giovanni Di Giuseppe, Bahaa E. A. Saleh, and Malvin Carl Teich  »View Author Affiliations

Optics Express, Vol. 18, Issue 19, pp. 20475-20490 (2010)

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Lithium niobate photonic circuits have the salutary property of permitting the generation, transmission, and processing of photons to be accommodated on a single chip. Compact photonic circuits such as these, with multiple components integrated on a single chip, are crucial for efficiently implementing quantum information processing schemes. We present a set of basic transformations that are useful for manipulating modal qubits in Ti:LiNbO3 photonic quantum circuits. These include the mode analyzer, a device that separates the even and odd components of a state into two separate spatial paths; the mode rotator, which rotates the state by an angle in mode space; and modal Pauli spin operators that effect related operations. We also describe the design of a deterministic, two-qubit, single-photon, CNOT gate, a key element in certain sets of universal quantum logic gates. It is implemented as a Ti:LiNbO3 photonic quantum circuit in which the polarization and mode number of a single photon serve as the control and target qubits, respectively. It is shown that the effects of dispersion in the CNOT circuit can be mitigated by augmenting it with an additional path. The performance of all of these components are confirmed by numerical simulations. The implementation of these transformations relies on selective and controllable power coupling among single- and two-mode waveguides, as well as the polarization sensitivity of the Pockels coefficients in LiNbO3.

© 2010 Optical Society of America

OCIS Codes
(130.3730) Integrated optics : Lithium niobate
(230.7380) Optical devices : Waveguides, channeled
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

Original Manuscript: July 19, 2010
Revised Manuscript: September 3, 2010
Manuscript Accepted: September 3, 2010
Published: September 10, 2010

Mohammed F. Saleh, Giovanni Di Giuseppe, Bahaa E. A. Saleh, and Malvin Carl Teich, "Modal and polarization qubits in Ti:LiNbO3 photonic circuits for a universal quantum logic gate," Opt. Express 18, 20475-20490 (2010)

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