28 May 2013 A phase-unlocked Hong-Ou-Mandel interferometer
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There exists a fundamental dimensional mismatch between the Hong-Ou-Mandel (HOM) interferometer and two-photon states: while the latter are represented using two temporal (or spectral) dimensions, the HOM interferometer allows access to only one temporal dimension owing to its single delay element. We introduce a linear two-photon interferometer containing two independent delays spanning the two-photon state. By unlocking the fixed phase relationship between the interfering two-photon probability amplitudes in a HOM interferometer, one of these probability amplitudes now serves as a delay-free two-photon reference against which the other beats, thereby resolving ambiguities in two-photon state identification typical of HOM interferometry. We discuss the operation of this phase-unlocked HOM on a variety of input states focusing on instances where this new interferometer outperforms a traditional HOM interferometer: frequency-correlated states and states produced by a pulse doublet pump. Additionally, this interferometer affords the opportunity to synchronize two-photon states in a manner analogous to an HOM interferometer; moreover, it extends that capability to the aforementioned class of states.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Timothy M. Yarnall, Timothy M. Yarnall, Ayman F. Abouraddy, Ayman F. Abouraddy, Giovanni Di Guiseppe, Giovanni Di Guiseppe, "A phase-unlocked Hong-Ou-Mandel interferometer", Proc. SPIE 8749, Quantum Information and Computation XI, 87490G (28 May 2013); doi: 10.1117/12.2018094; https://doi.org/10.1117/12.2018094


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