Free-Space Quantum Communication with a Portable Quantum Memory

Namazi, Mehdi; Vallone, Giuseppe; Jordaan, Bertus; Goham, Connor; Shahrokhshahi, Reihaneh; Villoresi, Paolo; Figueroa, Eden

doi:10.1103/physrevapplied.8.064013

Cited by 16 publications

(11 citation statements)

References 44 publications

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“…Recent studies have demonstrated the potential of room-temperature quantum devices for this purpose, including the demonstration of noiseless room-temperature quantum memories for single-photons and polarization qubits [23][24][25] with coherence times of several seconds in ambient conditions [26]. Furthermore, preliminary quantum networks using room-temperature memories are already available [27,28].…”

Section: Introductionmentioning

confidence: 99%

An elementary 158 km long quantum network connecting room temperature quantum memories

Du,

Stankus,

Saira

et al. 2021

Preprint

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First-generation long-distance quantum repeater networks require quantum memories capable of interfacing with telecom photons to perform quantum-interferencemediated entanglement generation operations. The ability to demonstrate these interconnections using real-life fiber connections in a long-distance setting is paramount to realize a scalable quantum internet. Here we address these significant challenges by observing Hong-Ou-Mandel (HOM) interference between indistinguishable telecom photons produced in two independent room temperature quantum memories, separated by a distance of 158 km. We obtained interference visibilities after long-distance propagation of V = (38 ± 2)% for single-photon level experimental inputs. This first-of-its-kind quantum network prototype connecting quantum laboratories in Stony Brook University and Brookhaven National Laboratory is envisioned to evolve into a large-scale memory-assisted entanglement distribution quantum network, the basis for inter-city quantum communication.

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Section: Introductionmentioning

confidence: 99%

An elementary 158 km long quantum network connecting room temperature quantum memories

Du,

Stankus,

Saira

et al. 2021

Preprint

Self Cite

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“…The latter avenue has given rise to the field of quantum optics, which is now widely studied theoretically and employed experimentally [4]. Development of quantum optics has led to the formation of the rapidly growing area of quantum optical technologies, with applications such as quantum sensing [5][6][7], quantum computing [8], and quantum communication with conventional [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] and small satellites [24,25]. These applications have in common the fact that, in order to surpass their classical counterparts, a tremendous control over quantum states is required.…”

Section: Introductionmentioning

confidence: 99%

Spacetime effects on wavepackets of coherent light

Bruschi,

Chatzinotas,

Wilhelm

et al. 2021

Preprint

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We investigate the interplay between gravity and the quantum coherence present in the state of a pulse of light propagating in curved spacetime. We first introduce an operational way to distinguish between the overall shift in the pulse wavepacket and its genuine deformation after propagation. We then apply our technique to quantum states of photons that are coherent in the frequency degree of freedom, as well as to states of completely incoherent light. We focus on Gaussian profiles and frequency combs and find that the quantum coherence initially present can enhance the deformation induced by propagation in a curved background. These results further supports the claim that genuine quantum features, such as quantum coherence, can be used to probe the gravitational properties of physical systems. We specialize our techniques to Earth-to-satellite communication setups, where the effects of gravity are weak but can be tested with current satellite technologies.

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“…It is also somewhat surprising that even though only a small fraction of atoms traverse both laser beams, their contribution to the resonance slope is comparable with the single-channel resonance amplitude. Moreover, the possibility of such spin coherence transfer may need to be accounted for in multiplexed experimental arrangements, commonly used in quantum optics [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Transit Ramsey EIT resonances in a Rb vacuum cell

2019

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We investigate a dual-channel arrangement for electromagnetically-induced transparency in a vacuum Rb vapor cell, and report the observation of a transient spectral feature due to the atoms traversing both beams while preserving their ground-state spin coherence. Despite a relatively small fraction of atoms participating in this process, their contribution to the overall lineshape is not negligible. By adjusting the path difference between the two optical beams, the differential intensity measurement can produce an error signal for the microwave frequency stabilization as strong as a single-channel measurement, but it provides a much higher signal-to-noise ratio due to the cancellation of intensity noise, dominating the signal channel detection.

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Free-Space Quantum Communication with a Portable Quantum Memory

Cited by 16 publications

References 44 publications

An elementary 158 km long quantum network connecting room temperature quantum memories

An elementary 158 km long quantum network connecting room temperature quantum memories

Spacetime effects on wavepackets of coherent light

Transit Ramsey EIT resonances in a Rb vacuum cell

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