Fiber Loop Quantum Buffer for Photonic Qubits
- URL: http://arxiv.org/abs/2309.07987v1
- Date: Thu, 14 Sep 2023 18:56:07 GMT
- Title: Fiber Loop Quantum Buffer for Photonic Qubits
- Authors: Kim Fook Lee, Gamze Gul, Zhao Jim, and Prem Kumar
- Abstract summary: We report a quantum buffer based on a low-loss 2$times$2 switch and a unit delay made of a fiber delay line.
We characterize the device by using a two-photon polarization entangled state in which one photon of the entangled photon pair is stored and retrieved at a repetition rate up to 78$,rmkHz$.
The device, which enables integer multiples of a unit delay, can store the qubit state in a unit of fiber delay line up to 5.4$,rmkm$ and the number of loop round-trips up to 3
- Score: 2.874893537471256
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We report a fiber loop quantum buffer based on a low-loss 2$\times$2 switch
and a unit delay made of a fiber delay line. We characterize the device by
using a two-photon polarization entangled state in which one photon of the
entangled photon pair is stored and retrieved at a repetition rate up to
78$\,\rm{kHz}$. The device, which enables integer multiples of a unit delay,
can store the qubit state in a unit of fiber delay line up to 5.4$\,\rm{km}$
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 $>94\%$
with a maximum storage time of 52$\,\mu\rm{sec}$. 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 (ATM) based
quantum networks.
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