Interferometric approach to open quantum systems and non-Markovian dynamics

Experimental Snapshot Verification of non-Markovianity with Unknown System-Probe Coupling

“…Here ∆n = n H − n V is the birefringence of the medium, where n H and n V are the refractive indices in the horizontal (H) and vertical (V) directions, respectively. This polarization-frequency model has been recently popular in the studies of quantum information in open quantum systems [17,19,30,[39][40][41][42][43][44][45][46]. If the fast axes of the quartz plates in the combination are not aligned, the dynamics becomes significantly more complicated.…”

Engineering of Hong-Ou-Mandel interference with effective noise

“…Here, we consider two photons in a HOM interferometer, analyze the effects of dephasing noise before and after the beam splitter, and emphasize the coincidence/bunching paradigm, going well beyond previous works dealing with HOM interference and birefringence [35][36][37][38]. Besides deepening the understanding on open system interference [34], our setting creates a wide platform for possible applications that work with arbitrarily long path differences, ranging from constructing Bell states to dynamical delayed choice erasure.…”

“…Commonly in the linear optical framework, the open system is polarization, environment is frequency, and their interaction occurs in a birefringent medium [24][25][26][27][28][29][30][31][32][33][34]. In [34], dephasing was studied in the context of singlephoton interference from the point of view of open quantum systems.…”

“…Commonly in the linear optical framework, the open system is polarization, environment is frequency, and their interaction occurs in a birefringent medium [24][25][26][27][28][29][30][31][32][33][34]. In [34], dephasing was studied in the context of singlephoton interference from the point of view of open quantum systems. Here, we consider two photons in a HOM interferometer, analyze the effects of dephasing noise before and after the beam splitter, and emphasize the coincidence/bunching paradigm, going well beyond previous works dealing with HOM interference and birefringence [35][36][37][38].…”

Experimental quantum probing measurements with no knowledge of the system-probe interaction

“…Our system of interest is the frequency degree of freedom of a single photon and our probe is the polarization of the same photon. This system has attracted a lot of attention lately [19][20][21][22][23][24][25][26][27]. We show how measuring two polarization states before and after their interaction with the frequency can be used to extract upper bounds for the width of the corresponding frequency spectra.…”