Double-Fock superposition interferometry for differential diagnosis of decoherence

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Interferometric signals are degraded by decoherence, which encompasses dephasing, mixing and any distinguishing which-path information. These three paradigmatic processes are fundamentally different, but, for coherent, single-photon and N00N-states, they degrade interferometric visibility in the very same way, which impedes the diagnosis of the cause for reduced visibility in a single experiment. We introduce a versatile formalism for many-boson interferometry based on double-sided Feynman diagrams, which we apply to a protocol for differential decoherence diagnosis: twin-Fock states vertical bar N, N > with N >= 2 reveal to what extent decoherence is due to path distinguishability or to mixing, while double-Fock superpositions vertical bar N: M > = (vertical bar N, M > + vertical bar M, N >)/root 2 with N > M > 0 additionally witness the degree of dephasing. Hence, double-Fock superposition interferometry permits the differential diagnosis of decoherence processes in a single experiment, indispensable for the assessment of interferometers.
Publisher
IOP PUBLISHING LTD
Issue Date
2015-01
Language
English
Article Type
Article
Citation

NEW JOURNAL OF PHYSICS, v.17, pp.023008

ISSN
1367-2630
DOI
10.1088/1367-2630/17/2/023008
URI
http://hdl.handle.net/10203/247186
Appears in Collection
PH-Journal Papers(저널논문)
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