Fiber loop quantum buffer for photonic qubits

Fook Lee, Kim; Gül, Gamze; Jim, Zhao; Kumar, Prem

doi:10.1088/1367-2630/ad6703

Title: Fiber loop quantum buffer for photonic qubits

Journal Article · 12 August 2024 · New Journal of Physics

DOI: https://doi.org/10.1088/1367-2630/ad6703 · OSTI ID:2429091

;

; Jim, Zhao;

Abstract We report a fiber loop quantum buffer based on a low-loss 2 × 2 switch and a unit delay made of a fiber delay line. We characterize the device by using a two-photon polarization entangled state in which one photon of the entangled photon pair is stored and retrieved at a repetition rate up to 78 kHz. The device, which enables integer multiples of a unit delay, can store the qubit state in a unit of fiber delay line up to 5.4 km and the number of loop round-trips up to 3. Furthermore, we configure the device with other active elements to realize integer multiplier and divider of a unit delay of a qubit. The quantum state tomography is performed on the retrieved photon and its entangled photon. We obtain a state fidelity $>$ 94 $%$ with a maximum storage time of 52 s with an insertion loss of 5.56 dB. To further characterize the storing and retrieving processes of the device, we perform entanglement-assisted quantum process tomography on the buffered qubit state. The process fidelity of the device is $>$ 0.98. Our result implies that the device preserves the superposition and entanglement of a qubit state from a two-photon polarization-entangled state. This is a significant step towards facilitating applications in optical asynchronous transfer mode based quantum networks.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0020537

OSTI ID:: 2429091

Journal Information:: New Journal of Physics, Journal Name: New Journal of Physics Journal Issue: 8 Vol. 26; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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