Quantum Storage of Frequency-Multiplexed Heralded Single Photons

Seri, Alessandro; Lago-Rivera, Dario; Lenhard, Andreas; Corrielli, Giacomo; Osellame, Roberto; Mazzera, Margherita; Riedmatten, Hugues de

doi:10.1103/physrevlett.123.080502

Cited by 125 publications

(105 citation statements)

References 51 publications

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“…This QM has many degrees of freedom of frequency where the absorption line is constructed, except in the case of an extremely small frequency difference (~10 MHz) because of the hyperfine structure. Some previous studies have investigated multifrequency modes 48,49 . In the case of Pr 3+ :YSO, the achievable atomic-frequency-comb range is <4.6 MHz, and the inhomogeneous bandwidth is of the order of several to tens of GHz (when the concentration of the dopant Pr 3+ is 1%); however, we could not measure the largest bandwidth accurately.…”

Section: Discussionmentioning

confidence: 99%

Two-photon comb with wavelength conversion and 20-km distribution for quantum communication

et al. 2020

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Quantum computing and quantum communication, have been greatly developed in recent years and expected to contribute to quantum internet technologies, including cloud quantum computing and unconditionally secure communication. However, long-distance quantum communication is challenging mainly because of optical fiber losses; quantum repeaters are indispensable for fiber-based transmission because unknown quantum states cannot be amplified with certainty. In this study, we demonstrate a versatile entanglement source in the telecom band for fiber-based quantum internet, which has a narrow linewidth of sub-MHz range, entanglement fidelity of more than 95%, and Bell-state generation even with frequency multimode. Furthermore, after a total distribution length of 20-km in fiber, twophoton correlation is observed with an easily identifiable normalized correlation coefficient, despite the limited bandwidth of the wavelength converter. The presented implementation promises an efficient method for entanglement distribution that is compatible with quantum memory and frequency-multiplexed long-distance quantum communication applications.

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Section: Discussionmentioning

confidence: 99%

Two-photon comb with wavelength conversion and 20-km distribution for quantum communication

et al. 2020

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“…The third one is using femtosecond-laser micromachining (FLM). Recently, integrable memories are successfully demonstrated, based on waveguides fabricated in a Pr 3+ : Y 2 SiO 5 crystal using FLM [21][22][23]. Storage time of up to 15 µs [21], storage efficiency as high as 21 % [22], and storage modes as many as 130 [23], have been achieved.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, integrable memories are successfully demonstrated, based on waveguides fabricated in a Pr 3+ : Y 2 SiO 5 crystal using FLM [21][22][23]. Storage time of up to 15 µs [21], storage efficiency as high as 21 % [22], and storage modes as many as 130 [23], have been achieved. These results are comparable with the performance of bulk crystals [24][25][26], thus making FLM an appealing technique to achieve integrated quantum memories.…”

Section: Introductionmentioning

confidence: 99%

Reliable coherent optical memory based on a laser-written waveguide

Liu¹,

Zhou²,

Zhu³

et al. 2020

Optica

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151 Eu 3+ -doped yttrium silicate ( 151 Eu 3+ : Y 2 SiO 5 ) crystal is a unique material that possesses hyperfine states with coherence time up to 6 h. Many efforts have been devoted to the development of this material as optical quantum memories based on the bulk crystals, but integrable structures (such as optical waveguides) that can promote 151 Eu 3+ : Y 2 SiO 5 -based quantum memories to practical applications, have not been demonstrated so far. Here we report the fabrication of type II waveguides in a 151 Eu 3+ : Y 2 SiO 5 crystal using femtosecond-laser micromachining. The resulting waveguides are compatible with single-mode fibers and have the smallest insertion loss of 4.95 dB. On-demand light storage is demonstrated in a waveguide by employing the spinwave atomic frequency comb (AFC) scheme and the revival of silenced echo (ROSE) scheme. We implement a series of interference experiments based on these two schemes to characterize the storage fidelity. Interference visibility of the readout pulse is 0.99 ± 0.03 for the spin-wave AFC scheme and 0.97 ± 0.02 for the ROSE scheme, demonstrating the reliability of the integrated optical memory.

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“…Akiba [6] Cold Rb atom EIT 14 0.25 7.7 Clausen [7] Nd:Y 2 SiO 5 AFC 21 0.025 30 Zhang [8] Cold Rb atom EIT 9.8 0.2 10 Rieländer [10] Pr:Y 2 SiO 5 AFC 11 1.5 11 Seri [35] P r :Y 2 SiO 5 AFC 12 1.5 61 Seri [36] P r :Y different physical systems in a quantum network [31]. By using a time-dependent coupling pulse during the retrieval process, it could be used to generate single photons with widely tunable waveform [32], as well as a quantum buffer to match the temporal mode of different single-photon sources [33].…”

Section: Groupmentioning

confidence: 99%

Quantum storage and manipulation of heralded single photons in atomic memories based on electromagnetically induced transparency

Tsai

Hsiao

Chen

2020

Phys. Rev. Research

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We demonstrate the storage and manipulation of heralded single photons generated from a cavity-enhanced spontaneous parametric down-conversion (SPDC) source in the atomic quantum memory based on electromagnetically induced transparency. We show that nonclassical correlations are preserved between the heralding and the retrieved photons after storage process. By varying the intensity of the coupling field during retrieval process, we further demonstrate that the waveform or bandwidth of the single photons can be manipulated and the reduction of the nonclassical correlation between the photon pairs can be compensated. Our SPDC photon pairs are generated in a single pair of longitudinal cavity modes, which not only reduces the experimental complexity arising from external filtering but also increases the useful photon generation rate. Our results can be scaled up with ease and thus lay the foundation for future realization of large-scale applications in quantum information processing.

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Quantum Storage of Frequency-Multiplexed Heralded Single Photons

Cited by 125 publications

References 51 publications

Two-photon comb with wavelength conversion and 20-km distribution for quantum communication

Two-photon comb with wavelength conversion and 20-km distribution for quantum communication

Reliable coherent optical memory based on a laser-written waveguide

Quantum storage and manipulation of heralded single photons in atomic memories based on electromagnetically induced transparency

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