A1 Refereed original research article in a scientific journal
Balancing efficiencies by squeezing in realistic eight-port homodyne detection
Authors: Pellonpää Juha-Pekka, Schultz Jussi, Paris Matteo G A
Publisher: AMER PHYSICAL SOC
Publication year: 2011
Journal: Physical Review A
Journal name in source: PHYSICAL REVIEW A
Journal acronym: PHYS REV A
Article number: ARTN 043818
Number in series: 4
Volume: 83
Issue: 4
Number of pages: 7
ISSN: 1050-2947
DOI: https://doi.org/10.1103/PhysRevA.83.043818
Self-archived copy’s web address: https://research.utu.fi/converis/portal/Publication/3790436
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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