Massively-multiplexed generation of Bell-type entanglement using a quantum memory

Lipka, Michał; Mazelanik, Mateusz; Leszczyński, Adam; Wasilewski, Wojciech; Parniak, Michał

doi:10.1038/s42005-021-00551-1

Cited by 18 publications

(12 citation statements)

References 74 publications

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“…Unfortunately, the reported scheme 38 to encode the memory qubit is complex and very difficult to use for multiplexing. Very recently, a spatially multiplexed DLCZ-type quantum memory generating Bell-type entanglement was demonstrated in cold atoms 74 . Using a spatially resolved single-photon camera, the work achieved large-scale multimode quantum correlations between Stokes and anti-Stokes photons, with lifetimes up to 50 µs.…”

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confidence: 99%

Long-lived and multiplexed atom-photon entanglement interface with feed-forward-controlled readouts

Wang

Yan

et al. 2021

Commun Phys

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Quantum interfaces (QIs) that generate entanglement between photonic and spin-wave (atomic memory) qubits are basic building block for quantum repeaters. Realizing ensemble-based repeaters in practice requires quantum memory providing long lifetimes and multimode capacity. Significant progress has been achieved on these separate goals. The remaining challenge is to combine the two attributes into a single QI. Here, by establishing spatial multimode, magnetic-field-insensitive and long-wavelength spin-wave storage in laser-cooled atoms inside a phase-passively-stabilized polarization interferometer, we constructed a multiplexed QI that stores up to three long-lived spin-wave qubits. Using a feed-forward-controlled system, we demonstrated that a multiplexed QI gives rise to a 3-fold increase in the atom–photon (photon–photon) entanglement-generation probability compared with single-mode QIs. For our multiplexed QI, the measured Bell parameter is 2.51±0.01 combined with a memory lifetime of up to 1 ms. This work represents a key step forward in realizing fiber-based long-distance quantum communications.

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confidence: 99%

Long-lived and multiplexed atom-photon entanglement interface with feed-forward-controlled readouts

Wang

Yan

et al. 2021

Commun Phys

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“…87 Rb, with a memory lifetime of about 28 µs [7]. Using a single-photon resolving camera Parniak et al [8] showed non-classical storage in up to 665 spatial modes for up to 50 µs in 87 Rb, and more recently bipartite entanglement across 500 modes [41]. However, none of these experiments involved a telecom-compatible photon, which would also require interfacing the memory with a quantum frequency converter [42].…”

Section: Resultsmentioning

confidence: 99%

Remote distribution of non-classical correlations over 1250 modes between a telecom photon and a $^{171}$Yb$^{3+}$:Y$_2$SiO$_{5}$ crystal

Businger¹,

Nicolas²,

Mejia³

et al. 2022

Preprint

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Quantum repeaters based on heralded entanglement require quantum nodes that are able to generate multimode quantum correlations between memories and telecommunication photons. The communication rate scales linearly with the number of modes, yet highly multimode quantum storage remains challenging. In this work, we demonstrate an atomic frequency comb quantum memory with a time-domain mode capacity of 1250 modes and a bandwidth of 100 MHz, to our knowledge the largest number of modes stored in the quantum regime. The memory is based on a Y2SiO5 crystal doped with 171 Yb 3+ ions, with a memory wavelength of 979 nm. The memory is interfaced with a source of non-degenerate photon pairs at 979 and 1550 nm, bandwidth-matched to the quantum memory. We obtain strong non-classical second-order cross correlations over all modes, for storage times of up to 25 µs. The telecommunication photons propagated through 5 km of fiber before the release of the memory photons, a key capability for quantum repeaters based on heralded entanglement and feed-forward operations. Building on this experiment should allow distribution of entanglement between remote quantum nodes, with enhanced rates owing to the high multimode capacity.

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“…Given the configuration of laser beams, i.e., angle between coupling and signal light, the atomic coherence has a 50 rad/mm transverse wavevector component. This gives ≈260 μs of thermal-motion-limited storage time 60 . The control field-induced spin-wave decay rate 37 in the experiment is about 10kHz.…”

Section: Methodsmentioning

confidence: 99%

Optical-domain spectral super-resolution via a quantum-memory-based time-frequency processor

2022

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Existing super-resolution methods of optical imaging hold a solid place as an application in natural sciences, but many new developments allow for beating the diffraction limit in a more subtle way. One of the recently explored strategies to fully exploit information already present in the field is to perform a quantum-inspired tailored measurements. Here we exploit the full spectral information of the optical field in order to beat the Rayleigh limit in spectroscopy. We employ an optical quantum memory with spin-wave storage and an embedded processing capability to implement a time-inversion interferometer for input light, projecting the optical field in the symmetric-antisymmetric mode basis. Our tailored measurement achieves a resolution of 15 kHz and requires 20 times less photons than a corresponding Rayleigh-limited conventional method. We demonstrate the advantage of our technique over both conventional spectroscopy and heterodyne measurements, showing potential for application in distinguishing ultra-narrowband emitters, optical communication channels, or signals transduced from lower-frequency domains.

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Massively-multiplexed generation of Bell-type entanglement using a quantum memory

Cited by 18 publications

References 74 publications

Long-lived and multiplexed atom-photon entanglement interface with feed-forward-controlled readouts

Long-lived and multiplexed atom-photon entanglement interface with feed-forward-controlled readouts

Remote distribution of non-classical correlations over 1250 modes between a telecom photon and a $^{171}$Yb$^{3+}$:Y$_2$SiO$_{5}$ crystal

Optical-domain spectral super-resolution via a quantum-memory-based time-frequency processor

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