Optical quantum memory with optically inaccessible noble-gas spins

Katz, Or; Reches, Eran; Shaham, Roy; Gorshkov, Alexey V.; Firstenberg, Ofer

doi:10.48550/arxiv.2007.08770

Cited by 6 publications

(15 citation statements)

References 37 publications

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“…Significantly, in this scheme, the multi-photon entangled state is generated, which are helpful to correct the photon loss before transmitting the signal qubit to the next node. In addition, Katz et al also proposed a quantum memory protocol based on a new physical mechanism [279] in the same year, which is to map the photonic state to longlifetime but optically inaccessible noble-gas spins collective state. This scheme provides a new hardware to realize light-matter entanglement and further build a global quantum network.…”

Section: P Atom−atom Experimental Counting Rate Fidelitymentioning

confidence: 99%

Towards Real‐World Quantum Networks: A Review

Wei

Jing

Zhang

et al. 2022

Laser & Photonics Reviews

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Quantum networks play an extremely important role in quantum information science, with application to quantum communication, computation, metrology, and fundamental tests. One of the key challenges for implementing a quantum network is to distribute entangled flying qubits to spatially separated nodes, at which quantum interfaces or transducers map the entanglement onto stationary qubits. The stationary qubits at the separated nodes constitute quantum memories realized in matter while the flying qubits constitute quantum channels realized in photons. Dedicated efforts around the world for more than 20 years have resulted in both major theoretical and experimental progress toward entangling quantum nodes and ultimately building a global quantum network. Here, the development of quantum networks and the experimental progress over the past two decades leading to the current state of the art for generating entanglement of quantum nodes based on various physical systems such as single atoms, cold atomic ensembles, trapped ions, diamonds with nitrogen-vacancy centers, and solid-state host doped with rare-earth ions are reviewed. Along the way, the merits are discussed and the potential of each of these systems toward realizing a quantum network is compared.

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Section: P Atom−atom Experimental Counting Rate Fidelitymentioning

confidence: 99%

Towards Real‐World Quantum Networks: A Review

Wei

Jing

Zhang

et al. 2022

Laser & Photonics Reviews

View full text Add to dashboard Cite

show abstract

“…A large time-bandwidth product usually requires temporal variations of external classical fields. Indeed, variations of the magnetic and control fields can be done during the reading and writing processes to increase the bandwidth and, during the memory time, to decouple the noble-gas spins from the alkali and consequently reduce its decoherence rate down to γ b [35,36].…”

Section: Discussionmentioning

confidence: 99%

“…It is remarkable that the signal field is attenuated so efficiently by the mixture of alkali and noble-gas spins, despite each of them separately being transparent to light at the signal frequency. As this optical coupling exploits the long-lived coherence of the noble-gas spins, it could have various applications in precision measurements of magnetic or anomalous fields [21,49] and in the generation of long-lived entanglement and optical quantum memories for quantum sensing and quantum information processing [32,35].…”

Section: Discussionmentioning

confidence: 99%

“…Since alkali spins do couple to light, the pickup of the NMR signal can be done optically, and in this way narrow spectra and long-lived spin precession signals are routinely obtained [28][29][30][31]. Yet, various quantum optics applications require an efficient bi-directional coupling between light and noble-gas spins [32][33][34][35][36]. Such coupling, corresponding to a resonant optical excitation of the long-lived nuclear spins, has never been realized.…”

Section: Introductionmentioning

confidence: 99%

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Coupling light to a nuclear spin gas with a two-photon linewidth of five millihertz

Katz,

Shaham,

Firstenberg

2021

Preprint

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Nuclear spins of noble gases feature extremely long coherence times but are inaccessible to optical photons. Here we realize a coherent interface between light and noble-gas spins that is mediated by alkali atoms. We demonstrate the optical excitation of the noble-gas spins and observe the coherent back-action on the light in the form of high-contrast two-photon spectra. We report on a record two-photon linewidth of 5 ± 0.7 mHz (millihertz) above room-temperature, corresponding to a one-minute coherence time. This experiment provides a demonstration of coherent bi-directional coupling between light and noble-gas spins, rendering their long-lived spin coherence accessible for manipulations in the optical domain.

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“…Significantly, in this scheme, the multi-photon entangled state is generated, which are helpful to correct the photon loss before transmitting the signal qubit to the next node. In addition, O. Katz et al also proposed a quantum memory protocol based on a new physical mechanism [276] in the same year, which is to map the photonic state to long-lifetime but optically inaccessible noble-gas spins collective state. This scheme provide a new hardware to realize light-matter entanglement and further build a global quantum network.…”

Section: Quantum Network With Emerging New Hardware Approachesmentioning

confidence: 99%

Towards real-world quantum networks: a review

Wei,

Jing,

Zhang

et al. 2022

Preprint

View full text Add to dashboard Cite

Quantum networks play an extremely important role in quantum information science, with application to quantum communication, computation, metrology and fundamental tests. One of the key challenges for implementing a quantum network is to distribute entangled flying qubits to spatially separated nodes, at which quantum interfaces or transducers map the entanglement onto stationary qubits. The stationary qubits at the separated nodes constitute quantum memories realized in matter while the flying qubits constitute quantum channels realized in photons. Dedicated efforts around the world for more than twenty years have resulted in both major theoretical and experimental progress towards entangling quantum nodes and ultimately building a global quantum network. Here, we review the development of quantum networks and the experimental progress over the past two decades leading to the current state of the art for generating entanglement of quantum nodes based on various physical systems such as single atoms, cold atomic ensembles, trapped ions, diamonds with Nitrogen-Vacancy centers, solid-state host doped with rare-earth ions, etc. Along the way we discuss the merits and compare the potential of each of these systems towards realizing a quantum network.

show abstract

Optical quantum memory with optically inaccessible noble-gas spins

Cited by 6 publications

References 37 publications

Towards Real‐World Quantum Networks: A Review

Towards Real‐World Quantum Networks: A Review

Coupling light to a nuclear spin gas with a two-photon linewidth of five millihertz

Towards real-world quantum networks: a review

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