Proposal for space-borne quantum memories for global quantum networking

Gündoğan, Mustafa; Sidhu, Jasminder S.; Henderson, Victoria; Mazzarella, Luca; Wolters, Janik; Oi, Daniel K. L.; Krutzik, Marcus

doi:10.1038/s41534-021-00460-9

Cited by 69 publications

(56 citation statements)

References 71 publications

(97 reference statements)

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“…For establishing quantum communication over intercontinental distances, it has been shown that making use of a satellite with a quantum memory can provide an advantage over systems without memory [21,22], e.g., higher key rates for setups with only one satellite and shorter entanglement distribution times for multiple satellites. Quantum memories in principle suited for satellites have been demonstrated, e.g.…”

Section: Resultsmentioning

confidence: 99%

“…[31], and its inclusion is one of the primary improvements of the protocol compared to the previous results in Ref. [21]. Discarding leftover qubits in memory after each cycle in the protocol in Ref.…”

Section: Cutoff Timesmentioning

confidence: 98%

“…The continuous sending of pairs is conceptually similar to the up-link scenario considered in Ref. [21] with the difference that here the entangled pair sources are located on board of satellites instead of being on the ground. However, here the waiting times cannot be eliminated completely as the central satellite still has to wait for confirmation that a qubit arrived at the ground station before performing the entanglement swap-…”

Section: A Scenariomentioning

confidence: 99%

“…However, untrusted node operation for beyond-line-of-sight distances towards truly global scales requires the implementation of a QR protocol enabled by on-board quantum memories (QMs) [21,22]. Furthermore, QMs do not only help increase the overall network range but also offer a solution to low detection rates in entanglement-based schemes [23][24][25][26][27][28] and thus facilitate memory-assisted QKD (MA-QKD) protocols which can be thought of as a single-node QR link.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we comprehensively analyze multiple quantum repeater schemes that rely on satellites with quantum memories for continental and intercontinental distances [30], substantially going beyond our earlier work [21]. We make use of an event-based Monte Carlo simulation that enables the analysis of quantum repeaters with multi-mode memories.…”

Section: Introductionmentioning

confidence: 99%

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Simulating quantum repeater strategies for multiple satellites

Wallnöfer,

Hahn,

Gündoğan

et al. 2021

Preprint

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A global quantum repeater network involving satellite-based links is likely to have advantages over fiberbased networks in terms of long-distance communication, since the photon losses in free space scale only polynomially with the distance -compared to the exponential losses in optical fibers. To simulate the performance of such networks, we have introduced a scheme of large-scale event-based Monte Carlo simulation of quantum repeaters with multiple memories that can faithfully represent loss and imperfections in these memories. In this work, we identify the quantum key distribution rates achievable in various satellite and ground station geometries for feasible experimental parameters. The power and flexibility of the simulation toolbox allows us to explore various strategies and parameters, some of which only arise in these more complex, multi-satellite repeater scenarios. As a primary result, we conclude that key rates in the kHz range are reasonably attainable for intercontinental quantum communication with three satellites, only one of which carries a quantum memory.

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Section: Resultsmentioning

confidence: 99%

Section: Cutoff Timesmentioning

confidence: 98%

Section: A Scenariomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulating quantum repeater strategies for multiple satellites

Wallnöfer,

Hahn,

Gündoğan

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

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Identifying Electronic Transitions of Defects in Hexagonal Boron Nitride for Quantum Memories

Cholsuk,

Çakan,

Suwanna

et al. 2024

Advanced Optical Materials

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A quantum memory is a crucial keystone for enabling large‐scale quantum networks. Applicable to the practical implementation, specific properties, i.e., long storage time, selective efficient coupling with other systems, and a high memory efficiency are desirable. Though many quantum memory systems are developed thus far, none of them can perfectly meet all requirements. This work herein proposes a quantum memory based on color centers in hexagonal boron nitride (hBN), where its performance is evaluated based on a simple theoretical model of suitable defects in a cavity. Employing density functional theory calculations, 257 triplet and 211 singlet spin electronic transitions are investigated. Among these defects, it is found that some defects inherit the Λ electronic structures desirable for a Raman‐type quantum memory and optical transitions can couple with other quantum systems. Further, the required quality factor and bandwidth are examined for each defect to achieve a 95% writing efficiency. Both parameters are influenced by the radiative transition rate in the defect state. In addition, inheriting triplet‐singlet spin multiplicity indicates the possibility of being a quantum sensing, in particular, optically detected magnetic resonance. This work therefore demonstrates the potential usage of hBN defects as a quantum memory in future quantum networks.

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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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Proposal for space-borne quantum memories for global quantum networking

Cited by 69 publications

References 71 publications

Simulating quantum repeater strategies for multiple satellites

Simulating quantum repeater strategies for multiple satellites

Identifying Electronic Transitions of Defects in Hexagonal Boron Nitride for Quantum Memories

Towards Real‐World Quantum Networks: A Review

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