Double-Fock superposition interferometry for differential diagnosis of decoherence

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 $\mid N,N\rangle $ with $N\geqslant 2$ reveal to what extent decoherence is due to path distinguishability or to mixing, while double-Fock superpositions $\mid N:M\rangle =\left( \mid N,M\rangle +\mid M,N\rangle \right)/\sqrt{2}$ with $N\gt M\gt 0$ 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

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch
• Notes: New journal of physics. - 17, 2 (2015) , 023008, ISSN: 1367-2630

Contributors, Places and Time

• Event: Veröffentlichung
• (where): Freiburg
• (who): Universität
• (when): 2022
• Creator: Tichy, Malte Christopher ; Ra, Young-Sik ; Lim, Hyang-Tag ; Gneiting, Clemens ; Kim, Yoon-Ho ; Mølmer, Klaus

Further information

• DOI: 10.1088/1367-2630/17/2/023008
• URN: urn:nbn:de:bsz:25-freidok-2258151
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 25.03.2025, 1:51 PM CET