A multiplexed quantum memory

Lan, Shau-Yu; Radnaev, A. G.; Collins, O. A.; Matsukevich, Dzmitry; Kennedy, Tom; Kuzmich, A.

doi:10.1364/oe.17.013639

Cited by 94 publications

(102 citation statements)

References 24 publications

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“…(13). A method to circumvent this problem is to use the phase modulation as a tool to change the sign of the amplitude modulation, so that it always remains positive.…”

Section: Appendix: Aom Double Pass Compensation For Arbitrary Amplitumentioning

confidence: 99%

“…The entanglement distribution rate in these schemes scales linearly with the number of modes used for multiplexing. However, this requires quantum memories that can store large number of modes, which could be encoded in time [10,11], frequency [12], or space [13]. All quantum memory schemes based on atomic ensembles can be used for efficient spatial multimode storage [14].…”

Section: Introductionmentioning

confidence: 99%

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Towards highly multimode optical quantum memory for quantum repeaters

et al. 2016

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Long-distance quantum communication through optical fibers is currently limited to a few hundreds of kilometres due to fiber losses. Quantum repeaters could extend this limit to continental distances. Most approaches to quantum repeaters require highly multimode quantum memories in order to reach high communication rates. The atomic frequency comb memory scheme can in principle achieve high temporal multimode storage, without sacrificing memory efficiency. However, previous demonstrations have been hampered by the difficulty of creating high-resolution atomic combs, which reduces the efficiency for multimode storage. In this article we present a comb preparation method that allows one to increase the multimode capacity for a fixed memory bandwidth. We apply the method to a 151 Eu 3+ -doped Y 2 SiO 5 crystal, in which we demonstrate storage of 100 modes for 51 μs using the AFC echo scheme (a delay-line memory) and storage of 50 modes for 0.541 ms using the AFC spin-wave memory (an on-demand memory). We also briefly discuss the ultimate multimode limit imposed by the optical decoherence rate, for a fixed memory bandwidth.

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“…(13). A method to circumvent this problem is to use the phase modulation as a tool to change the sign of the amplitude modulation, so that it always remains positive.…”

Section: Appendix: Aom Double Pass Compensation For Arbitrary Amplitumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Towards highly multimode optical quantum memory for quantum repeaters

et al. 2016

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“…Most existing demonstrations of single-photon storage and retrieval [19,124,[136][137][138][139] used the generation of correlated photon pairs, described above, as a source of heralded single photons with controllable delay between the heralding (Stokes) and signal (anti-Stokes) pulses. With this technique the bandwidth of the emitted photons matches the EIT bandwidth in atomic ensembles used for storage; and the waveform of the generated few-photon pulses can still be modified with additional protocols [116,125,127,[140][141][142].…”

Section: Single-photon Storagementioning

confidence: 99%

Electromagnetically induced transparency‐based slow and stored light in warm atoms

Novikova

Walsworth

Xiao

2011

Laser & Photonics Reviews

318

172

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This paper reviews recent efforts to realize a highefficiency memory for optical pulses using slow and stored light based on electromagnetically induced transparency (EIT) in ensembles of warm atoms in vapor cells. After a brief summary of basic continuous-wave and dynamic EIT properties, studies using weak classical signal pulses in optically dense coherent media are discussed, including optimization strategies for stored light efficiency and pulse-shape control, and modification of EIT and slow/stored light spectral properties due to atomic motion. Quantum memory demonstrations using both single photons and pulses of squeezed light are then reviewed. Finally a brief comparison with other approaches is presented.

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“…However, at most two (entangled) qubits have been stored simultane-ously in a way that allowed selecting the mode mapping [15], and the scalability of the approach, which relied on encoding information into four spatial modes, to tens or hundreds of qubits and modes remains to be proven (we note related work by Lan et al [16] that, however, is not based on memories as defined above).…”

mentioning

confidence: 99%

“…For instance, considering as few as 10 frequency, 10 temporal and 10 spatial modes, photons in 1000 different modes can be multiplexed, which already suffices for a quantum repeater. Or, considering 500 frequency, 10 spatial [16] and 400 temporal modes [30], one could simultaneously store 10 6 qubits. Note that any multiplexed degree of freedom can be manipulated to render photons indistinguishable -in our demonstration we used frequency.…”

mentioning

confidence: 99%

Spectral Multiplexing for Scalable Quantum Photonics using an Atomic Frequency Comb Quantum Memory and Feed-Forward Control

et al. 2014

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Future multi-photon applications of quantum optics and quantum information science require quantum memories that simultaneously store many photon states, each encoded into a different optical mode, and enable one to select the mapping between any input and a specific retrieved mode during storage. Here we show, with the example of a quantum repeater, how to employ spectrallymultiplexed states and memories with fixed storage times that allow such mapping between spectral modes. Furthermore, using a Ti:Tm:LiNbO3 waveguide cooled to 3 Kelvin, a phase modulator, and a spectral filter, we demonstrate storage followed by the required feed-forward-controlled frequency manipulation with time-bin qubits encoded into up to 26 multiplexed spectral modes and 97% fidelity.PACS numbers: 03.67. Hk, 42.50.Ex, 32.80.Qk, 78.47.jf Further advances towards scalable quantum optics [1,2] and quantum information processing [3,4] rely on joint measurements of multiple photons that encode quantum states (e.g. qubits) [3][4][5]. However, as photons generally arrive in a probabilistic fashion, either due to a probabilistic creation process or due to loss during transmission, such measurements are inherently inefficient. For instance, this leads to exponential scaling of the time required to establish entanglement, the very resource of quantum information processing, as a function of distance in a quantum relay [6]. This problem can be overcome by using quantum memories, which are generally realized through the reversible mapping of quantum states between light and matter [7,8]. For efficient operation, these memories must be able to simultaneously store many photon states, each encoded into a different optical mode, and subsequently (using feed-forward) allow selecting the mapping between input and retrieved modes (e.g., different spectral or temporal modes). This enables making several photons arriving at a measurement device indistinguishable, thereby rendering joint measurements deterministic. For instance, revisiting the example of entanglement distribution, a quantum relay supplemented with quantum memories changes it to a repeater and, in principle, the scaling from exponential to polynomial [4,9].Interestingly, for such multimode quantum memories to be useful, it is not necessary to map any input mode onto any retrieved (output) mode, but it often suffices if a single input mode, chosen once a photon is stored, can be mapped onto a specific output mode (e.g. characterized by the photon's spectrum and recall time) [4,10]. This ensures that the photons partaking in a joint measurement, each recalled from a different quantum memory, are indistinguishable, as required, e.g., for a Bell-state measurement. We emphasize that it does not matter if the device used to store quantum states also allows the mode mapping, or if the mode mapping is performed after recall using appended devices -we will refer to the system allowing storage and mode mapping as the memory.To date, most research assumes photons arriving at different times at the m...

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A multiplexed quantum memory

Cited by 94 publications

References 24 publications

Towards highly multimode optical quantum memory for quantum repeaters

Towards highly multimode optical quantum memory for quantum repeaters

Electromagnetically induced transparency‐based slow and stored light in warm atoms

Spectral Multiplexing for Scalable Quantum Photonics using an Atomic Frequency Comb Quantum Memory and Feed-Forward Control

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