Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Demonstration of Distributed Quantum Sensing using Nonlinear Optics

Xueshi Guo, C. R. Bream, Johannes Borregaard, Shuro Izumi, Mikkel V. Larsen, Jonas Schou Neergaard-Nielsen, Ulrik L. Andersen

Published Jun 1, 2019• 1 citation
Publisher

Abstract

Quantum technology consists very often of networks: Quantum communication is inherently a network while some quantum computing architectures are based on networking to realize scalability. Quantum sensing can be also realized in a networked setup employing entangled states and specialized measurements with applications in e.g. magnetic field mapping and precision clocks [1,2].

DOI
10.1109/cleoe-eqec.2019.8873146

Related papers

Certifying the Topology of Quantum Networks: Theory and Experiment

Lisa T. Weinbrenner, Nidhin Prasannan, Kiara Hansenne +5 more

Distributed quantum information in networks is paramount for global secure quantum communication. Moreover, it finds applications as a resource for relevant tasks, such as clock synchronization, magnetic field sensing, and blind quantum computation. For quantum network analysis and benchmarking of implementations, however, it is crucial to characterize the topology of networks in a way that reveals the nodes between which entanglement can be reliably distributed. Here, we demonstrate an efficient scheme for this topology certification. Our scheme allows for distinguishing, in a scalable manner, different networks consisting of bipartite and multipartite entanglement sources. It can be applied to semi-device-independent scenarios also, where the measurement devices and network nodes are not well characterized and trusted. We experimentally demonstrate our approach by certifying the topology of different six-qubit networks generated with polarized photons, employing active feed-forward and time multiplexing. Our methods can be used for general simultaneous tests of multiple hypotheses with few measurements, being useful for other certification scenarios in quantum technologies.

arXiv:2309.12907•Physical Review Letters•Jun 11, 2024•15 citations

Continuous variable distributed quantum sensing in integrated photonics

Bethany Puzio, Oliver M. Green, Joel F. Tasker +7 more

Distributed quantum sensing is an emerging application of quantum networking, where entangled probe states are employed to sense combinations of delocalized parameters with enhanced precision relative to using separable states. Squeezed states of light are a prime resource for experimental demonstrations of entanglement-enhanced sensing, because they can be generated and entangled deterministically. Existing distributed quantum sensing experiments have been fundamentally limited in scalability due to their bulk-optic architectures. Meanwhile, integrated photonics provides a scalable and compact platform for quantum sensors. Here we demonstrate entanglement-enhanced sensing of linear functions of four phase shifts in an integrated photonic circuit. We find an entanglement-enhanced precision of 0.199(16) dB below the shot noise limit compared to 0.041(18) dB for separable states. A four-mode entangled state is generated on-chip with entanglement verification and phase sensing also performed on-chip with an array of four integrated homodyne detectors.

quant-pharXiv:2609.19092•Quantum 2.0 Conference and Exhibition•Sep 17, 2026•0 citations

Quantum Communication and Networking: Advancing From Fundamental Technology to Quantum Network Testbeds

Lijun Ma, Anouar Rahmouni, Yicheng Shi +2 more

The rise of quantum communication and networking heralds a transformative opportunity: distributed computing over quantum networks. This article offers a concise overview of the evolution of quantum communication and networking, highlights fundamental technologies and challenges, explores the efforts on real-world quantum network testbeds, and outlines our perspectives and ongoing efforts in this promising direction.

IEEE Internet Computing•Mar 1, 2026•0 citations

Nonlinear Photonics for Applications in Quantum Science and Technology

Alexander L. Gaeta

Nonlinear photonics offers the potential to solve several key challenges that would greatly enable quantum computing and networking. Full-text article not available; see video presentation

OSA Advanced Photonics Congress•Jan 1, 2024•0 citations

Quantum networking and internetworking

Rodney Van Meter

Quantum networks build on entanglement and quantum measurement to bring new capabilities to communication systems. Quantum physical effects can be used to detect eavesdropping, to improve the shared sensitivity of separated astronomical instruments, or to create distributed states that will enable numerical quantum computation over a distance using teleportation. Because quantum data is fragile and some quantum operations are probabilistic, errors and distributed calculations must be managed aggressively and perhaps cooperatively among nodes. Solutions to these problems will have both similarities to and differences from purely classical networks. Architectures for large-scale quantum networking and internetworking are in development, paralleling theoretical and experimental work on physical layers and low-level error management and connection technologies. With unentangled quantum networks already deployed, entangled networks may appear within the next few years and will form a vibrant research topic in the coming decade.

IEEE Network•Jan 1, 2012•57 citations

Comprehensive Study of Entanglement Photon Source: Bulk Optics, Waveguides and Integrated Photonic Chip Hardware

Sai Sidhartha H, P. Poonguzhali

In quantum technology, entanglement is the key resource to perform experiments in quantum computing, quantum communication, quantum sensing and metrology. Generation, characterization and distribution of entanglement deterministically is still an active research area. In contemporary, probabilistic entanglement sources based on parametric down-conversion process remain the workhorse for experimental demonstrations and practical applications, despite their inherent limitations of on-demand entangled photon generation. Over the years, three main technological architectures have evolved for generating probabilistic entangled-photon source; bulk-optics, waveguides and integrated photonic chips, each comprising several distinct architectural approaches tailored to different applications. This review article talks about the state of the art in probabilistic entangled photon source, examining the advancement from free space bulk non-linear optics to fiber based waveguides and scalable photonic chips with their current limitations, presenting a road map for researchers to choose the most appropriate platform for their quantum photonic applications.

EPJ Web of Conferences•Jan 1, 2026•0 citations
Quantum technology consists very often of networks: Quantum communication is inherently a network while some quantum computing architectures are based on networking to realize scalability. Quantum sensing can be also realized in a networked setup employing entangled states and specialized measurements with applications in e.g. magnetic field mapping and precision clocks [1,2].
Distributed quantum information in networks is paramount for global secure quantum communication. Moreover, it finds applications as a resource for relevant tasks, such as clock synchronization, magnetic field sensing, and blind quantum computation. For quantum network analysis and benchmarking of implementations, however, it is crucial to characterize the topology of networks in a way that reveals the nodes between which entanglement can be reliably distributed. Here, we demonstrate an efficient scheme for this topology certification. Our scheme allows for distinguishing, in a scalable manner, different networks consisting of bipartite and multipartite entanglement sources. It can be applied to semi-device-independent scenarios also, where the measurement devices and network nodes are not well characterized and trusted. We experimentally demonstrate our approach by certifying the topology of different six-qubit networks generated with polarized photons, employing active feed-forward and time multiplexing. Our methods can be used for general simultaneous tests of multiple hypotheses with few measurements, being useful for other certification scenarios in quantum technologies.
Distributed quantum sensing is an emerging application of quantum networking, where entangled probe states are employed to sense combinations of delocalized parameters with enhanced precision relative to using separable states. Squeezed states of light are a prime resource for experimental demonstrations of entanglement-enhanced sensing, because they can be generated and entangled deterministically. Existing distributed quantum sensing experiments have been fundamentally limited in scalability due to their bulk-optic architectures. Meanwhile, integrated photonics provides a scalable and compact platform for quantum sensors. Here we demonstrate entanglement-enhanced sensing of linear functions of four phase shifts in an integrated photonic circuit. We find an entanglement-enhanced precision of 0.199(16) dB below the shot noise limit compared to 0.041(18) dB for separable states. A four-mode entangled state is generated on-chip with entanglement verification and phase sensing also performed on-chip with an array of four integrated homodyne detectors.
Quantum networks build on entanglement and quantum measurement to bring new capabilities to communication systems. Quantum physical effects can be used to detect eavesdropping, to improve the shared sensitivity of separated astronomical instruments, or to create distributed states that will enable numerical quantum computation over a distance using teleportation. Because quantum data is fragile and some quantum operations are probabilistic, errors and distributed calculations must be managed aggressively and perhaps cooperatively among nodes. Solutions to these problems will have both similarities to and differences from purely classical networks. Architectures for large-scale quantum networking and internetworking are in development, paralleling theoretical and experimental work on physical layers and low-level error management and connection technologies. With unentangled quantum networks already deployed, entangled networks may appear within the next few years and will form a vibrant research topic in the coming decade.
In quantum technology, entanglement is the key resource to perform experiments in quantum computing, quantum communication, quantum sensing and metrology. Generation, characterization and distribution of entanglement deterministically is still an active research area. In contemporary, probabilistic entanglement sources based on parametric down-conversion process remain the workhorse for experimental demonstrations and practical applications, despite their inherent limitations of on-demand entangled photon generation. Over the years, three main technological architectures have evolved for generating probabilistic entangled-photon source; bulk-optics, waveguides and integrated photonic chips, each comprising several distinct architectural approaches tailored to different applications. This review article talks about the state of the art in probabilistic entangled photon source, examining the advancement from free space bulk non-linear optics to fiber based waveguides and scalable photonic chips with their current limitations, presenting a road map for researchers to choose the most appropriate platform for their quantum photonic applications.