Experimental single-photon exchange along a space link of 7000 km

Dequal, Daniele; Vallone, Giuseppe; Bacco, Davide; Gaiarin, Simone; Luceri, V.; Bianco, G. Lo; Villoresi, Paolo

doi:10.1103/physreva.93.010301

Cited by 76 publications

(76 citation statements)

References 32 publications

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“…to-noise ratio and detection rate. Our work extends the limit of long-distance free-space single-photon exchange, which was demonstrated so far with a channel length of about 7000 km by exploiting a Medium-Earth-Orbit (MEO) satellite [27].…”

Section: Introductionsupporting

confidence: 60%

“…where A CCR and A tel are the areas of the CCR and the ground telescope, respectively [31]. An alternative approach is given in [27] in which the FFDP is approximated as a top-hat pattern with solid angle Ω, so that the diffraction transmittance is evaluated as A tel /(ΩR 2 ). Since the solid angle can be estimated by the array cross-section Σ [28,33], we have that…”

Section: Model Of the Channel Lossesmentioning

confidence: 99%

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Towards quantum communication from global navigation satellite system

Calderaro

Agnesi

Dequal

et al. 2018

Quantum Sci. Technol.

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Satellite-based quantum communication is an invaluable resource for the realization of a quantum network at the global scale. In this regard, the use of satellites well beyond the low Earth orbits gives the advantage of long communication time with a ground station. However, high-orbit satellites pose a great technological challenge due to the high diffraction losses of the optical channel, and the experimental investigation of such quantum channels is still lacking. Here, we report on the first experimental exchange of single photons from Global Navigation Satellite System at a slant distance of 20000 kilometers, by exploiting the retroreflector array mounted on GLONASS satellites. We also observed the predicted temporal spread of the reflected pulses due to the geometrical shape of array. Finally, we estimated the requirements needed for an active source on a satellite, aiming towards quantum communication from GNSS with state-of-the-art technology.

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Section: Introductionsupporting

confidence: 60%

Section: Model Of the Channel Lossesmentioning

confidence: 99%

Towards quantum communication from global navigation satellite system

Calderaro

Agnesi

Dequal

et al. 2018

Quantum Sci. Technol.

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“…Such simplicity renders our source suitable for CubeSat missions, where a small footprint and low energy consumption are of critical importance [20]. Furthermore, the temporal stability of the source attests the compatibility with QKD links with satellites even in Middle Earth Orbit [21], or part of a Global Navigation Satellite Systems [22], where visibility times between the ground station and satellite can exceed the hour.…”

Section: Discussionmentioning

confidence: 98%

All-fiber self-compensating polarization encoder for quantum key distribution

Agnesi¹,

Avesani²,

Stanco³

et al. 2019

Opt. Lett.

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Quantum Key Distribution (QKD) allows distant parties to exchange cryptographic keys with unconditional security by encoding information on the degrees of freedom of photons. Polarization encoding has been extensively used in QKD implementations along free-space, optical fiber and satellite-based links. However, the polarization encoders used in such implementations are unstable, expensive, complex and can even exhibit side-channels that undermine the security of the implemented protocol. Here we propose a self-compensating polarization encoder based on a Lithium Niobate phase modulator inside a Sagnac interferometer and implement it using only standard telecommunication commercial off-the-shelves components (COTS). Our polarization encoder combines a simple design and high stability reaching an intrinsic quantum bit error rate as low as 0.2%. Since realization is possible from the 800 nm to the 1550 nm band by using COTS, our polarization modulator is a promising solution for free-space, fiber and satellite-based QKD.

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“…The distribution of quantum states between distant parties, connected by a free-space link, is one of the main technological challenges towards a global-scale quantum Internet. Several proof-of-concept studies have already demonstrated the high-fidelity transmission of entangled photons up to 143 km for a ground link [144], 1200 km with a satellite link for quantum communication on a global scale [145], and transmission of attenuate laser up to Global Navigation Satellite Orbit [146,147]. However, until very recently, most of the demonstrations used a bipartite binary photonic system while only a few took advantage of qudit encoding.…”

Section: Free-space Linksmentioning

confidence: 99%

High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges

et al. 2019

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In recent years, there has been a rising interest in high‐dimensional quantum states and their impact on quantum communication. Indeed, the availability of an enlarged Hilbert space offers multiple advantages, from larger information capacity and increased noise resilience, to novel fundamental research possibilities in quantum physics. Multiple photonic degrees of freedom have been explored to generate high‐dimensional quantum states, both with bulk optics and integrated photonics. Furthermore, these quantum states have been propagated through various channels, for example, free‐space links, single‐mode, multicore, and multimode fibers, and also aquatic channels, experimentally demonstrating the theoretical advantages over 2D systems. Here, the state‐of‐the‐art on the generation, propagation, and detection of high‐dimensional quantum states is reviewed. Quantum communication with states living in d‐dimensional Hilbert spaces, qudits, yields great benefits. However, qudits generation, transmission, and detection is not a simple task to accomplish. This review presents the state‐of‐the‐art on the generation, propagation, and measurement of high‐dimensional quantum states, highlighting their advantages, issues, and future perspectives.

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Experimental single-photon exchange along a space link of 7000 km

Cited by 76 publications

References 32 publications

Towards quantum communication from global navigation satellite system

Towards quantum communication from global navigation satellite system

All-fiber self-compensating polarization encoder for quantum key distribution

High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges

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