Topical White Paper: A Case for Quantum Memories in Space

Gündoğan, Mustafa; Jennewein, Thomas; Asadi, Faezeh Kimiaee; Ros, Elisa Da; Sağlamyürek, Erhan; Oblak, Daniel; Vogl, Thomas; Rieländer, Daniel; Sidhu, Jasminder S.; Grandi, Samuele; Mazzarella, Luca; Wallnöfer, Julius; Ledingham, Patrick M.; LeBlanc, Lindsay J.; Mazzera, Margherita; Mohageg, Makan; Wolters, Janik; Ling, Alexander; Atatüre, Mete; Riedmatten, Hugues de; Oi, Daniel K. L.; Simon, Christoph; Krutzik, Markus

doi:10.48550/arxiv.2111.09595

Cited by 5 publications

(3 citation statements)

References 111 publications

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“…Additionally, utilizing more recent finite key calculations that specifically address space-based QKD scenarios can potentially increase calculated secret key lengths by approximately ∼10%. Finally, ULL QMs in orbit may also serve as useful probes to investigate the intersection of quantum physics and general relativity [51] and enable human-assisted Bell tests across Earth-Moon distances [11,52,53].…”

Section: Discussionmentioning

confidence: 99%

Time-delayed single quantum repeater node for global quantum communications with a single satellite

Gündoğan¹,

Sidhu²,

Oi³

et al. 2023

Preprint

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Quantum networking on a global scale is an immensely challenging endeavor that is fraught with significant technical and scientific obstacles. While various types of quantum repeaters have been proposed they are typically limited to distances of a few thousand kilometers or require extensive hardware overhead. Recent proposals suggest that space-borne quantum repeaters composed of a small number of satellites carrying on-board quantum memories would be able to cover truly global distances. In this paper, we propose an alternative to such repeater constellations using an ultra-long lived quantum memory in combination with a second memory with a shorter storage time. This combination effectively acts as a time-delayed version of a single quantum repeater node. We investigate the attainable finite key rates and demonstrate an improvement of at least three orders of magnitude over prior single-satellite methods that rely on a single memory, while simultaneously reducing the necessary memory capacity by the same amount. We conclude by suggesting an experimental platform to realize this scheme.

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Section: Discussionmentioning

confidence: 99%

Time-delayed single quantum repeater node for global quantum communications with a single satellite

Gündoğan¹,

Sidhu²,

Oi³

et al. 2023

Preprint

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“…A quantum memory is a device that stores the quantum state of an incoming light pulse and releases it on-demand at a later time. Such a device placed in space could function as a hub of a world-wide quantum network, linking quantum computers on different continents [12]. A state of the art clock on a space based platform such as we describe here could function as a world-wide master clock, synchronizing clocks around the world.…”

Section: Practical Benefitsmentioning

confidence: 99%

A quantum science space station

Thompson¹,

Mohageg²,

Kellogg³

et al. 2022

Quantum Sci. Technol.

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In the coming years we expect to see a diverse array of quantum instruments being developed and flown in space, including quantum gas experiments, optical clocks, atom interferometry experiments, and quantum information/quantum optics experiments. The International Space Station has proven itself as an exceptional platform for such missions, providing long-term microgravity in a pressurized and temperature controlled environment, with ample power, thermal and data resources. However the station is currently planned to operate only through 2030, well before many proposed quantum sciences missions could be ready for launch, and we undertake here to explore what an ideal follow-on platform might look like. In particular, we believe that a much smaller and less expensive low Earth orbiting (LEO) facility, optimized and dedicated to quantum science, could be an exceptionally powerful platform for exploring the quantum world and harnessing quantum technology. Such a platform would allow multiple quantum instruments to share resources and explore related phenomena in concert.

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“…Inspired by the practical implementations, theoretical proposals [18][19][20] aimed to be the pathfinders for a global-scale quantum network have been made that consider optical downlinks, uplinks and inter-satellite links. The quantum satellites have been recognized as either the trusted node or the untrusted node [21], where the satellite can directly mediate the distribution of secure encryption keys pairwise between the optical ground stations (OGSs).…”

Section: Introductionmentioning

confidence: 99%

Exploiting potentialities for space-based quantum communication network: downlink quantum key distribution modelling and scheduling analysis

Wang

Chen

et al. 2023

New J. Phys.

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The goal of the space-based quantum network is to form the backbone of the quantum internet for long-distance secure data transfer, networked distributed quantum information processing, and other applications. Consider that the quantum network evolved from a recent form where a satellite performs a sequence of satellite-to-ground quantum key distribution (SatQKD) missions that allow any two ground nodes to have the symmetric encryption keys, we here develop a framework for the SatQKD downlink modelling and scheduling analysis. Incorporated with the orbital caculation and the meteorological data to downlink SatQKD modelling, the dynamic characteristics of the satellite-to-ground optical transmission could be simulated. Our work shows that the satellite downlink scheduling allows for the possibility to consider strategies for different SatQKD missions such as extending connection for distant ground nodes, prioritized delivery and promoting keys utilization, which may guide design and analysis of future missions for future satellite application.

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Topical White Paper: A Case for Quantum Memories in Space

Cited by 5 publications

References 111 publications

Time-delayed single quantum repeater node for global quantum communications with a single satellite

Time-delayed single quantum repeater node for global quantum communications with a single satellite

A quantum science space station

Exploiting potentialities for space-based quantum communication network: downlink quantum key distribution modelling and scheduling analysis

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