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Your search keyword '"Namazi, Mehdi"' showing total 3 results
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3 results on '"Namazi, Mehdi"'

1. Automated distribution of high-rate, high-fidelity polarization entangled photons using deployed metropolitan fibers

Author

Craddock, Alexander N., Lazenby, Anne, Portmann, Gabriel Bello, Sekelsky, Rourke, Flament, Mael, and Namazi, Mehdi

Subjects
Quantum Physics
Abstract

Distributing high-fidelity, high-rate entanglement over telecommunication infrastructure is one of the main paths towards large-scale quantum networks, enabling applications such as quantum encryption and network protection, blind quantum computing, distributed quantum computing, and distributed quantum sensing. However, the fragile nature of entangled photons operating in real-world fiber infrastructure has historically limited continuous operation of such networks. Here, we present a fully automated system capable of distributing polarization entangled photons over a 34 km deployed fiber in New York City. We achieve end-to-end pair rates of nearly $5\times10^5$ pairs/s and entanglement fidelity of approximately $99\%$. Separately, we achieve 15 days of continuous distribution, with a network up-time of $99.84\%$. Our work paves the way for practical deployment of 24/7 entanglement-based networks with rates and fidelity adequate for many current and future use-cases.

Published
2024

3. Hong-Ou-Mandel interference of single-photon-level pulses stored in independent room-temperature quantum memories.

Author

Gera, Sonali, Wallace, Chase, Flament, Mael, Scriminich, Alessia, Namazi, Mehdi, Kim, Youngshin, Sagona-Stophel, Steven, Vallone, Giuseppe, Villoresi, Paolo, and Figueroa, Eden

Subjects
QUANTUM states, INDEPENDENT sets, MEMORY, QUANTUM computers, QUBITS
Abstract

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. [ABSTRACT FROM AUTHOR]

Published
2024
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