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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 9 — May. 6, 2013
  • pp: 11546–11553

Stable control of 10 dB two-mode squeezed vacuum states of light

Tobias Eberle, Vitus Händchen, and Roman Schnabel  »View Author Affiliations


Optics Express, Vol. 21, Issue 9, pp. 11546-11553 (2013)
http://dx.doi.org/10.1364/OE.21.011546


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Abstract

Continuous variable entanglement is a fundamental resource for many quantum information tasks. Important protocols like superactivation of zero-capacity channels and finite-size quantum cryptography that provides security against most general attacks, require about 10 dB two-mode squeezing. Additionally, stable phase control mechanisms are necessary but are difficult to achieve because the total amount of optical loss to the entangled beams needs to be small. Here, we experimentally demonstrate a control scheme for two-mode squeezed vacuum states at the telecommunication wavelength of 1550 nm. Our states exhibited an Einstein-Podolsky-Rosen covariance product of 0.0309 ± 0.0002, where 1 is the critical value, and a Duan inseparability value of 0.360±0.001, where 4 is the critical value. The latter corresponds to 10.45 ± 0.01dB which reflects the average non-classical noise suppression of the two squeezed vacuum states used to generate the entanglement. With the results of this work demanding quantum information protocols will become feasible.

© 2013 OSA

OCIS Codes
(270.6570) Quantum optics : Squeezed states
(270.5565) Quantum optics : Quantum communications
(270.5568) Quantum optics : Quantum cryptography

ToC Category:
Quantum Optics

History
Original Manuscript: March 5, 2013
Revised Manuscript: April 13, 2013
Manuscript Accepted: April 13, 2013
Published: May 3, 2013

Citation
Tobias Eberle, Vitus Händchen, and Roman Schnabel, "Stable control of 10 dB two-mode squeezed vacuum states of light," Opt. Express 21, 11546-11553 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-9-11546


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