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2017 ; 7
(1
): 1484
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Multi-copy quantifiers for single-photon states
#MMPMID28469155
Zapletal P
; Filip R
Sci Rep
2017[May]; 7
(1
): 1484
PMID28469155
show ga
Single-photon states are basic resources for hybrid quantum technology with
non-Gaussian states of light. Accelerating quantum technology is already able to
produce high-quality single-photon states. These states can be used for hybrid
quantum information processing, based on a nonclassical phase-space interference
represented by negativity of a Wigner function. Therefore, new quantifiers,
capable of evaluating such high-quality single-photon states, are required. We
propose and analyze quantifiers which process multiple estimates of single-photon
state's statistics. The quantifiers simulate basic capability of single photons
to conditionally bunch into a single mode and form a Fock state. This state
exhibits complex nonclassical phase-space interference effects making its Wigner
function negative in multiple areas. The quantifiers directly evaluate a presence
of the multiple negativities corresponding to the Fock state. We verify
applicability of the quantifiers by using them to single-photon states from
recent experiments. The quantifiers can be further extended to also test
indistinguishability of single-photon states. It allows to verify quantum
interference of light from single-photon emitters more sensitively than in the
traditional Hong-Ou-Mandel test. Besides quantum optics, the multi-copy
quantifiers can be also applied to experiments with atomic memories and
mechanical oscillators.
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