Quantum repeater networks require independent absorptive quantum memories capable of storing and retrieving indistinguishable photons to perform high-repetition entanglement swapping operations. The ability to perform these coherent operations at room temperature is of prime importance for the realization of scalable quantum networks. We perform Hong-Ou-Mandel (HOM) interference between photonic polarization states and single-photon-level pulses stored and retrieved from two sets of independent room-temperature quantum memories. We show that the storage and retrieval of polarization states from quantum memories does not degrade the HOM visibility for few-photon-level polarization states in a dual-rail configuration. For single-photon-level pulses, we measure the HOM visibility with various levels of background in a single polarization, single-rail QM, and investigate its dependence on the signal-to-background ratio. We obtain an HOM visibility of 43%, compared to the 48% no-memory limit of our set-up. These results allow us to estimate a 33% visibility for polarization qubits under the same conditions. These demonstrations lay the groundwork for future applications using large-scale memory-assisted quantum networks.
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Abstract -
Namazi, Mehdi ; Kupchak, Connor ; Jordaan, Bertus ; Shahrokhshahi, Reihaneh ; Figueroa, Eden ( , Physical Review Applied)
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Namazi, Mehdi ; Vallone, Giuseppe ; Jordaan, Bertus ; Goham, Connor ; Shahrokhshahi, Reihaneh ; Villoresi, Paolo ; Figueroa, Eden ( , Physical Review Applied)
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Namazi, Mehdi ; Mittiga, Thomas ; Kupchak, Connor ; Figueroa, Eden ( , Physical Review A)