A1 Journal article – refereed
Balancing efficiencies by squeezing in realistic eight-port homodyne detection

List of Authors: Pellonpää Juha-Pekka, Schultz Jussi, Paris Matteo G A
Publication year: 2011
Journal: Physical Review A
Journal name in source: PHYSICAL REVIEW A
Journal acronym: PHYS REV A
Number in series: 4
Volume number: 83
Issue number: 4
ISSN: 1050-2947

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.

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Last updated on 2019-20-07 at 15:25