28 May 2013 A phase-unlocked Hong-Ou-Mandel interferometer
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Abstract
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.
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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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