Conditional production of superpositions of coherent states with inefficient photon detection
Open Access
- 17 August 2004
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 70 (2), 020101
- https://doi.org/10.1103/physreva.70.020101
Abstract
It is shown that a linear superposition of two macroscopically distinguishable optical coherent states can be generated using a single photon source and simple all-optical operations. Weak squeezing on a single photon, beam mixing with an auxiliary coherent state, and photon detecting with imperfect threshold detectors are enough to generate a coherent state superposition in a free propagating optical field with a large coherent amplitude and high fidelity . In contrast to all previous schemes to generate such a state, our scheme does not need photon number resolving measurements nor Kerr-type nonlinear interactions. Furthermore, it is robust to detection inefficiency and exhibits some resilience to photon production inefficiency.
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