Extending Wheeler’s delayed-choice experiment to space

Vedovato, Francesco; Agnesi, Costantino; Schiavon, Matteo; Dequal, Daniele; Calderaro, Luca; Tomasin, Marco; Marangon, Davide G.; Stanco, Andrea; Luceri, V.; Bianco, G. Lo; Vallone, Giuseppe; Villoresi, Paolo

doi:10.1126/sciadv.1701180

Cited by 53 publications

(47 citation statements)

References 47 publications

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“…This setup has been called the delayed choice quantum eraser. In another experiment [15] the interferometer was built between an earth-based station and a satellite. The photons behaved like particles or waves depending on the choices made by the investigators on earth.…”

Section: Experimental Workmentioning

confidence: 99%

Projection Evolution of Quantum States—the Delayed Choice Puzzle

2018

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We discuss the problem of time in quantum mechanics. In the traditional formulation of quantum mechanics time enters the model as a parameter, not an observable, as was suggested by the famous Pauli theorem. It is now known, that Pauli's assumptions were too strong and that by removing some of them time can be represented as a quantum observable. In this case, instead of the unitary time evolution, other operators which map the initial space of states into the final space of states at each step of the evolution can be used. This allows to treat time as a quantum observable in a consistent way.

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Section: Experimental Workmentioning

confidence: 99%

Projection Evolution of Quantum States—the Delayed Choice Puzzle

2018

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“…Another recent work on satellite constellations for QKD networks but with different aims can be found in Reference [18]. Recently, Satellite quantum communication has witnessed an unprecedented growth including proof-of-principle experiments [19][20][21][22][23][24][25], quantum mechanics fundamental tests [26,27], and the launch and operation of a QKD satellite [28][29][30]. These groundbreaking results have spurred an international space race involving university consortia, national agencies and private companies, e.g., QKDSat (ArQit) [31], QUARTZ (SES) [32], QEYSSAT (Canada) [33], UK-Singapore Bilateral (RAL Space-CQT) [34], QUBE (Deutsches Zentrum für Luft-und Raumfahrt (DLR) + German Universities) [35], NANOBOB (Austria-France) [36] and IOD-6/ROKS (UK) [37].…”

Section: Introductionmentioning

confidence: 99%

QUARC: Quantum Research Cubesat—A Constellation for Quantum Communication

et al. 2020

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Quantum key distribution (QKD) offers future proof security based on fundamental laws of physics. Long-distance QKD spanning regions such as the United Kingdom (UK) may employ a constellation of satellites. Small satellites, CubeSats in particular, in low Earth orbit are a relatively low-cost alternative to traditional, large platforms. They allow the deployment of a large number of spacecrafts, ensuring greater coverage and mitigating some of the risk associated with availability due to cloud cover. We present our mission analysis showing how a constellation comprising 15 low-cost 6U CubeSats can be used to form a secure communication backbone for ground-based and metropolitan networks across the UK. We have estimated the monthly key rates at 43 sites across the UK, incorporating local meteorological data, atmospheric channel modelling and orbital parameters. We have optimized the constellation topology for rapid revisit and thus low-latency key distribution.

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“…The laws of quantum mechanics have been validated by numerous fundamental tests [1]. With the advent of optical satellite links [2][3][4][5][6] it is now possible to also validate quantum mechanics over vast distances and varying gravitational potentials. The transmission and detection of nonclassical states [7] such as quadrature squeezed states of the light field [8,9] constitutes an important task in this regard.…”

Section: Introductionmentioning

confidence: 99%

Binary homodyne detection for observing quadrature squeezing in satellite links

Müller

Seshadreesan

Peuntinger

et al. 2020

Phys. Rev. Research

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Optical satellite links open up new prospects for realizing quantum physical experiments over unprecedented length scales. We analyze and affirm the feasibility of detecting quantum squeezing in an optical mode with homodyne detection of only one bit resolution, as is found in satellites already in orbit. We show experimentally that, in combination with a coherent displacement, a binary homodyne detector can still detect quantum squeezing efficiently even under high loss. The sample overhead in comparison to nondiscretized homodyne detection is merely a factor of 3.3.

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Extending Wheeler’s delayed-choice experiment to space

Abstract: The quantum wave-particle duality of light is confirmed at the unprecedented distance of low-Earth-orbit satellites.

Cited by 53 publications

References 47 publications

Projection Evolution of Quantum States—the Delayed Choice Puzzle

Projection Evolution of Quantum States—the Delayed Choice Puzzle

QUARC: Quantum Research Cubesat—A Constellation for Quantum Communication

Binary homodyne detection for observing quadrature squeezing in satellite links

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