The Deep Space Quantum Link: Prospective Fundamental Physics Experiments using Long-Baseline Quantum Optics

Mohageg, Makan; Mazzarella, Luca; Strekalov, Dmitry; Yu, Nan; Zhai, Aileen; Johnson, Spencer; Anastopoulos, Charis; Gallicchio, Jason; Hu, B. L.; Jennewein, Thomas; Lin, Shih-Yuin; Ling, Alexander; Marquardt, Christoph; Meister, Matthias; Roura, Albert; Wörner, Lisa; Schleich, Wolfgang P.; Newell, Raymond; Schubert, Christian; Vallone, Giuseppe; Villoresi, Paolo; Kwiat, Paul G.

doi:10.48550/arxiv.2111.15591

Cited by 8 publications

(18 citation statements)

References 189 publications

(277 reference statements)

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“…See also[230] for a description of the proposed Deep Space Quantum Link mission, whose goals include long-range teleportation, tests of gravitational coupling to quantum states, and advanced tests of quantum nonlocality.…”

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confidence: 99%

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Alonso,

Alpigiani,

Altschul

et al. 2022

Preprint

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We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportunities offered by their deployment in space, and the developments needed before cold atoms could be operated in space. The cold atom technologies discussed include atomic clocks, quantum gravimeters and accelerometers, and atom interferometers. Prospective applications include metrology, geodesy and measurement of terrestrial mass change due to, e.g., climate change, and fundamental science experiments such as tests of the equivalence principle, searches for dark matter, measurements of gravitational waves and tests of quantum mechanics. We review the current status of cold atom technologies and outline the requirements for their space qualification, including the development paths and the corresponding technical milestones, and identifying possible pathfinder missions to pave the way for missions to exploit the full potential of cold atoms in space. Finally, we present a first draft of a possible roadmap for achieving these goals, that we propose for discussion by the interested cold atom, Earth Observation, fundamental physics and other prospective scientific user communities, together with ESA and national space and research funding agencies. research areas. As anticipated for a Europe-based event, about 80% of the registrations are from European countries, as seen in the lower right panel of Fig. 1, but there is also significant North American and Asian participation.This community provides the backbone for long-term planning and the support needed to see the challenging cold atom missions foreseen in the road-map through to their successful completions. The participants display an excellent and diverse mix of expertise, building an outstanding basis for the success of the workshop and the development of the corresponding road-map, which defines possible interim and long-term scientific goals and outlines technological milestones. Section 2 is an introduction to our document, Sections 3 to 5 discuss our main science themes, namely atomic clocks, Earth Observation and fundamental physics, Section 6 discusses the technology developments required before quantum sensors can be deployed in space, Section 7 summarises the discussions during the Workshop, and in Section 8 we outline the corresponding Community road-map.

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confidence: 99%

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Alonso,

Alpigiani,

Altschul

et al. 2022

Preprint

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“…Thus it seems to us that primordial gravitons produced in the early universe would be the most likely source for the detection of graviton noise. Deep space experiments with long baseline interferometers (e.g., [68]) could provide a good platform for these quests. The theoretical underpinning of this kind of experiments is too important to be sidelined, namely, the possibility for verifying the quantum nature of gravitons in perturabative quantum gravity, especially when they are placed alongside with quantum information characteristics such as gravitational decoherence (see, e.g., [61,63]) mentioned in Sec.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Quantum Noise of Gravitons and Stochastic Force on Geodesic Separation

Cho,

2021

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In this work we consider the effects of gravitons and their fluctuations on the dynamics of two masses using the Feynman-Vernon influence functional formalism, applied to nonequilibrium quantum field theory and semiclassical stochastic gravity earlier by Calzetta, Hu and Verdaguer [1-3], and most recently, to this problem by Parikh, Wilczek and Zahariade [4-6]. The Hadamard function of the gravitons yields the noise kernel acting as a stochastic tensorial force in a Langevin equation governing the motion of the separation of the two masses. The fluctuations of the separation due to the graviton noise are then solved for various quantum states including the Minkowski vacuum, thermal, coherent and squeezed states. The previous considerations of Parikh et al. are only for some selected modes of the graviton, while in this work we have included all graviton modes and polarizations. We comment on the possibility of detecting these fluctuations in primordial gravitons using interferometors with long baselines in deep space experiments.

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“…This point is crucial for tests of foundational issues of quantum theory invoking quantum information concepts such as entanglement and decoherence or methods such as signaling and communication. This is especially so for quantum information experiments in space [2,3] and for experiments designed to explore quantum effects from gravity [4][5][6][7].…”

Section: Qits Not Based On Qft Are Incompletementioning

confidence: 99%

“…In practice, joint probabilities are expressed in terms of photodetection models, like Glauber's, whose derivation is rather heuristic. However, planned experiments in deep space [2,3] that involve measurement of EM field correlations will arguably require a first-principles analysis of joint probabilities in order to take into account the relative motion of detectors and delayed propagation at long distances.…”

Section: The Need Of a Qft Measurement Theorymentioning

confidence: 99%

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Quantum Field Theory based Quantum Information: Measurements and Correlations

Anastopoulos¹,

Hu²,

Savvidou³

2022

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This is the first in a series of papers aiming to develop a relativistic quantum information theory in terms of unequal-time correlation functions in quantum field theory. In this work, we highlight two formalisms which together can provide a useful theoretical platform suitable for further developments: 1) Quantum field measurements using the Quantum Temporal Probabilities (QTP) method; 2) Closed-Time-Path (CTP) formalism for causal time evolutions. QTP incorporates the detector into the quantum description, while emphasising that the records of measurement are macroscopic and can be expressed in terms of classical spacetime coordinates. We first present a new, elementary derivation of the QTP formulas for the probabilities of n measurement events. We then demonstrate the relation of QTP with the Closed-Time-Path formalism, by writing an explicit formula that relates the associated generating functionals. We exploit the path integral representation of the CTP formalism, in order to express the measured probabilities in terms of path integrals. After this, we provide some simple applications of the QTP formalism. In particular, we show how Unruh-DeWitt detector models and Glauber's photodetection theory appear as limiting cases. Finally, with quantum correlation being the pivotal notion in relativistic quantum information and measurements, we highlight the role played by the CTP two-particle irreducible effective action which enables one to tap into the resources of non-equilibrium quantum field theory for our stated purpose.

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The Deep Space Quantum Link: Prospective Fundamental Physics Experiments using Long-Baseline Quantum Optics

Cited by 8 publications

References 189 publications

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Quantum Noise of Gravitons and Stochastic Force on Geodesic Separation

Quantum Field Theory based Quantum Information: Measurements and Correlations

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