Development of compact entangled photon-pair sources for satellites

Anwar, Ali; Perumangatt, Chithrabhanu; Villar, Aitor; Lohrmann, Alexander; Ling, Alexander

doi:10.1063/5.0109702

Cited by 4 publications

(1 citation statement)

References 46 publications

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“…Although we underestimate noise, we also use very conservative parameters, representing off-the-shelf SPDC sources and detectors. Entanglement sources with rates of ≈ 10 9 − 10 10 s −1 are now available and we anticipate that they would soon be space ready [36,37]. Similarly, SNSPDs (superconducting nanowire single-photon detectors) can provide efficiencies much beyond 90%, far outperforming simple semiconductor based detectors we have assumed [38].…”

Section: Discussionmentioning

confidence: 99%

A quantum-assisted master clock in the sky: global synchronization from satellites at sub-nanosecond precision

Haldar,

Ducoing,

Agullo

et al. 2024

Preprint

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This article develops a protocol to synchronize clocks on board a network of satellites equipped with quantum resources. We show that, in such a constellation, satellites reinforce each other's sync capabilities, forming a common clock that is more stable and precise than its constituents. We envision the resulting network as a master clock able to distribute time across the globe, providing the basis for a future quantum global navigation satellite system or a space-based quantum network. As an example of its capabilities, we show that a constellation of 50 satellites equipped with modest quantum resources, and distributed amongst 5 orbits at an altitude of 500 km, allows the synchronization of clocks spread across the globe at sub-nanosecond precision.

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Section: Discussionmentioning

confidence: 99%

A quantum-assisted master clock in the sky: global synchronization from satellites at sub-nanosecond precision

Haldar,

Ducoing,

Agullo

et al. 2024

Preprint

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A tunable transition metal dichalcogenide entangled photon-pair source

Weissflog,

Fedotova,

Tang

et al. 2024

Nat Commun

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Entangled photon-pair sources are at the core of quantum applications like quantum key distribution, sensing, and imaging. Operation in space-limited and adverse environments such as in satellite-based and mobile communication requires robust entanglement sources with minimal size and weight requirements. Here, we meet this challenge by realizing a cubic micrometer scale entangled photon-pair source in a 3R-stacked transition metal dichalcogenide crystal. Its crystal symmetry enables the generation of polarization-entangled Bell states without additional components and provides tunability by simple control of the pump polarization. Remarkably, generation rate and state tuning are decoupled, leading to equal generation efficiency and no loss of entanglement. Combining transition metal dichalcogenides with monolithic cavities and integrated photonic circuitry or using quasi-phasematching opens the gate towards ultrasmall and scalable quantum devices.

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Simple but efficient polarization-entangled photon sources

Fazili,

Chauhan,

Chandrashekara

et al. 2024

J. Opt. Soc. Am. B

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We report on the design and characterization of polarization-entangled photon sources at NIR and telecom wavelengths, based on spontaneous parametric downconversion in a linear interferometric arrangement with beam displacers. The sources demonstrate state-of-the-art performance with respect to detected brightness, heralding efficiency, and entanglement visibility. Featuring a stable and compact profile with simple alignment, they hold great promise for future development of field- and space-ready prototypes, alongside serving as a practical guide for researchers interested in designing efficient entangled photon sources.

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Development of compact entangled photon-pair sources for satellites

Cited by 4 publications

References 46 publications

A quantum-assisted master clock in the sky: global synchronization from satellites at sub-nanosecond precision

A quantum-assisted master clock in the sky: global synchronization from satellites at sub-nanosecond precision

A tunable transition metal dichalcogenide entangled photon-pair source

Simple but efficient polarization-entangled photon sources

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