Double-Fock superposition interferometry for differential diagnosis of decoherence
SCIE
SCOPUS
- Title
- Double-Fock superposition interferometry for differential diagnosis of decoherence
- Authors
- Tichy, MC; Ra, YS; Lim, HT; Gneiting, C; Kim, YH; Molmer, K
- Date Issued
- 2015-01-30
- Publisher
- IOP PUBLISHING LTD
- Abstract
- 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.
- Keywords
- decoherence; entangled states; interferometry; non-classical states of photons; photon counting and statistics; QUANTUM INTERFERENCE; OPTICAL-PHASE; LIMIT; ENTANGLEMENT; MOLECULES; PHOTONS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13202
- DOI
- 10.1088/1367-2630/17/2/023008
- ISSN
- 1367-2630
- Article Type
- Article
- Citation
- NEW JOURNAL OF PHYSICS, vol. 17, 2015-01-30
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