Amplification of entangled states of squeezed light |
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Authors: | V N Gorbachev A I Trubilko |
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Institution: | (1) Laboratory of Quantum Information and Computing, St. Petersburg State University of Aerospace Instrumentation, St. Petersburg, 190000, Russia |
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Abstract: | Two amplification schemes are considered for entangled squeezed states of light, including an Einstein-Podolsky-Rosen entangled state of continuous variables (EPR pair): propagation in a nonlinear medium and reflection from a cavity. Both schemes make use of a parametric process that can be implemented in a periodic nonlinear medium. The existence of an integral of motion makes it possible to amplify an entangled state of light while preserving the initial entanglement. To analyze the cavity-based scheme, a master equation is derived for the density matrix of the field inside the cavity. The feasibility of amplification that preserves entanglement of an EPR pair is demonstrated for this scheme. |
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