Optimal squeezing and entanglement from noisy Gaussian operations

Details Optimal squeezing and entanglement from noisy Gaussian operations Optimal squeezing and entanglement from noisy Gaussian operations

2005-05-19

arxiv.org/abs/quant-ph/0505145v2

Phys. Rev. Lett. 96, 023004 (2006)

Physics

Quantum Physics

4 pages; accepted version (minor changes), Journal-ref added

Scientific paper

10.1103/PhysRevLett.96.023004

We investigate the creation of squeezing via operations subject to noise and losses and ask for the optimal use of such devices when supplemented by noiseless passive operations. Both single and repeated uses of the device are optimized analytically and it is proven that in the latter case the squeezing converges exponentially fast to its asymptotic optimum, which we determine explicitly. For the case of multiple iterations we show that the optimum can be achieved with fixed intermediate passive operations. Finally, we relate the results to the generation of entanglement and derive the maximal two-mode entanglement achievable within the considered scenario.

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