Fiber Loop Quantum Buffer for Photonic Qubits
Kim Fook Lee, Gamze Gul, Zhao Jim, and Prem Kumar

TL;DR
This paper presents a fiber loop quantum buffer capable of storing and retrieving photonic qubits with high fidelity, preserving entanglement, and enabling advanced quantum network functionalities.
Contribution
The work introduces a low-loss fiber loop quantum buffer with active delay control, demonstrating high-fidelity storage and retrieval of entangled photonic qubits over significant distances.
Findings
Achieved >94% state fidelity after storage
Maximum storage time of 52 microseconds
Process fidelity >0.98 indicating high preservation of quantum states
Abstract
We report a fiber loop quantum buffer based on a low-loss 22 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. 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 and the number of loop round-trips up to 3. Furthermore, we configure the device with other active elements to realize integer multiplies 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 with a maximum storage time of 52. To further characterize the storing and retrieving processes of the device, we perform…
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Taxonomy
TopicsQuantum Information and Cryptography · Quantum Computing Algorithms and Architecture · Neural Networks and Reservoir Computing
