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arXiv:2203.14844 · Physical Review Letters

Toward a Quantum Memory in a Fiber Cavity Controlled by Intracavity Frequency Translation

Philip J. Bustard, Kent Bonsma-Fisher, Cyril Hnatovsky, Dan Grobnic, Stephen J. Mihailov, Duncan England, Benjamin J. Sussman

Published Mar 21, 2022• 18 citations
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Abstract

We propose a quantum memory protocol based on trapping photons in a fiber-integrated cavity, comprised of a birefringent fiber with dichroic reflective end facets. Photons are switched into resonance with the fiber cavity by intracavity Bragg-scattering frequency translation, driven by ancillary control pulses. After the storage delay, photons are switched out of resonance with the cavity, again by intracavity frequency translation. We demonstrate storage of quantum-level THz-bandwidth coherent states for a lifetime up to 16 cavity round trips, or 200 ns, and a maximum overall efficiency of 73%.

DOI
10.1103/physrevlett.128.120501

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We propose a quantum memory protocol based on trapping photons in a fiber-integrated cavity, comprised of a birefringent fiber with dichroic reflective end facets. Photons are switched into resonance with the fiber cavity by intracavity Bragg-scattering frequency translation, driven by ancillary control pulses. After the storage delay, photons are switched out of resonance with the cavity, again by intracavity frequency translation. We demonstrate storage of quantum-level THz-bandwidth coherent states for a lifetime up to 16 cavity round trips, or 200 ns, and a maximum overall efficiency of 73%.
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We demonstrate the generation of photons within a fiber-cavity quantum memory, followed by later on-demand readout. Signal photons are generated by spontaneous four-wave mixing in a fiber cavity comprising a birefringent fiber with dichroic reflective end facets. The detection of the partner herald photon indicates the creation of the stored signal photon. After a delay, the signal photon is switched out of resonance with the fiber cavity by intracavity frequency translation using Bragg scattering four-wave mixing, driven by ancillary control pulses. We measure sub-Poissonian statistics in the output signal mode, with gAC(2)=0.54(1){g}_{\text{AC}}^{(2)}=0.54(1)gAC(2)​=0.54(1) in the first readout bin and a readout frequency translation efficiency of $\ensuremath{\approx}80%$. The 1/e1/e1/e memory lifetime is $\ensuremath{\approx}67$ cavity cycles, or 1.68 $\textmu{}\mathrm{s}$. In an alternate fiber cavity, we show a strategy for noise reduction and measure gAC(2)=0.068(10){g}_{\text{AC}}^{(2)}=0.068(10)gAC(2)​=0.068(10) after one cavity cycle.
We demonstrate the storage and retrieval of heralded single photons in a fiber-based cavity quantum memory. The photons are stored, and retrieved, from the memory using quantum frequency conversion which switches the photon into, and out of, resonance with the cavity. The photons, generated in the telecom O-band with a bandwidth of 81 GHz, are retrieved from the memory with a 1/ e lifetime of 1.64 µs, or 32.8 cavity round trips. We show that non-classical photon statistics remain for 70 round trips. The internal memory efficiency after 0.5 µs of storage is 10.9 ± 0.5%; a coupling efficiency of 60% into the memory cavity yields a total efficiency of 6.0 ± 0.3%. These results mark a crucial step forward in the development of fiber-based quantum memories, and high-bandwidth memories operating at telecom wavelengths, with applications to photon source multiplexing and fiber-based quantum networking.
An optical quantum memory scheme using two narrow-linewidth cavities and some optical fibers is proposed. The cavities are connected via an optical fiber, and the gap of each cavity can be adjusted to allow photons with a certain bandwidth to transmit through or reflect back. Hence, each cavity acts as a shutter and the photons can be stored in the optical fiber between the cavities at will. We investigate the feasibility of using this device in storing a single photon. We estimate that with current technology storage of a photon qubit for up to 50 clock cycles (round trips) could be achieved with a probability of success of 85%. We discuss how this figure could be improved.
Abstract Various near-term quantum networking applications will benefit from low-loss, fiber-coupled photonic quantum memory devices with high efficiencies. We demonstrate a fiber-coupled loop-and-switch quantum memory platform with a pass-through efficiency of ~54% and an overall storage efficiency that scales as ~0.5 N +1 where N is the number of storage cycles. We highlight the trade-off between memory lifetime and qubit accessibility in this platform by using two different storage cycle times of ~40 ns and ~0.5 μs, and demonstrate high-fidelity storage and retrieval of ultra-broadband single-photon polarization qubits in both cases.