Data di Pubblicazione:
2011
Citazione:
Balancing efficiencies by squeezing in realistic eight-port homodyne detection / J.-P. Pellonpaa, J. Schultz, M. Paris. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 83:4(2011), pp. 043818.043818.1-043818.043818.7.
Abstract:
We address measurements of covariant phase observables (CPOs) by means of realistic eight-port homodyne
detectors. We do not assume equal quantum efficiencies for the four photodetectors and investigate the conditions
under which the measurement of a CPO may be achieved. We show that balancing the efficiencies using an
additional beam splitter allows us to achieve a CPO at the price of reducing the overall effective efficiency, and
prove that it is never a smearing of the ideal CPO achievable with unit quantum efficiency. An alternative strategy
based on employing a squeezed vacuum as a parameter field is also suggested, which allows one to increase the
overall efficiency in comparison to the passive case using only a moderate amount of squeezing. Both methods
are suitable for implementation with current technology.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
J.-P. Pellonpaa, J. Schultz, M. Paris
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