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

IEEE International Conference on Quantum Computing and Engineering (QCE)

Distributing Polarization Entanglement Through a High-Speed Fiber-Optic Switch

Atiyya A. Davis, Brian T. Kirby, Thomas A. Searles, Daniel E. Jones

Published Aug 30, 2025• 0 citations
Publisher

Abstract

We experimentally characterize a high-speed, low-loss switch and verify that entanglement is preserved when transmitting one photon of a polarization-entangled pair through all configurations of the switch. The preservation of entanglement through the switch demonstrates the utility of the switch for quantum networking applications.
DOI
10.1109/qce65121.2025.10427

Related papers

Entanglement-Preserving Photonic Switching: Demonstration of Full Cross-Bar Operation with 25-GHz Capability

Neal N. Oza, Yu‐Ping Huang, Prem Kumar

We present an all-optical, fiber-based quantum switch that operates at high speeds with low loss and—most importantly—retains the incident photons’ quantum state, thereby making it useful for applications in quantum communications.

Optical Fiber Communication Conference•Jan 1, 2013•0 citations

Wavelength-Selective Distribution of Polarization Entanglement over Deployed Fiber

Anirudh Ramesh, Joaquín Chung, Gregory S. Kanter +6 more

We demonstrate distribution of polarization entangled photon-pairs across multiple channels in a 6 km loop of deployed fiber. We use an all-optical networking switch to route Bell-state photons in three different wavelength pairs and verify entanglement distribution in all channel pairs by measuring two-photon interference fringes.

•Jan 1, 2023•1 citation

Entanglement-Preserving Photonic Switching: Full Cross-Bar Operation With Quantum Data Streams

Neal N. Oza, Yu‐Ping Huang, Prem Kumar

As the field of quantum communications matures and adopts larger network topologies, it will require switches capable of multiplexing and demultiplexing entangled photons between network nodes. Such switches will need to operate at high speeds, with low loss, and minimal signal-band noise, while also retaining the quantum state of the routed photons. We present an all-optical, fiber-based, dual-in, dual-out switch that has a switching window of 45 ps and an insertion loss of <;3.0 dB. In addition, the switch introduces minimal degradation to the quantum state of the routed entangled photons. As a test of the switch's utility, we demultiplex a single quantum channel from a 6.5-GHz dual-channel quantum data stream. The recovered quantum state exhibits a fidelity of 96.2%±1.2% with the prepared state.

IEEE Photonics Technology Letters•Jan 24, 2014•18 citations

Distributed Entanglement in Deployable Quantum Networks

Atiyya A. Davis

Quantum networks exhibit enhanced performance compared to their classical counterparts, enabling secure communication and enhanced sensing protocols. Scalable quantum networks must transmit photons over distances ranging from kilometers to metropolitan scales while preserving entanglement. The objective of this thesis is to characterize the sources and switches of real-world deployed quantum networks, which require an intimate knowledge of nonlinear concepts and devices that drive these operating regimes. Importantly, quantum networks are deployed alongside existing classical communication infrastructure to ensure scalability and compatibility with established fiber-based systems. As a result, quantum and classical signals must coexist within the same telecommunication network. Because quantum infrastructure relies on optical fiber, these networks are susceptible to instabilities arising from fiber- induced effects. To fully realize a scalable quantum network, we investigated the quantum physical layer to optimize performance and identify limitations in our networking system. We characterized the performance of an entangled-photon source used to produce polarization-entangled photons. We then observe how well a high-speed, low-loss quantum switch preserves entanglement, demonstrating its utility for transmitting photons to different nodes in scalable quantum networks. We then analyze a 30 km deployed fiber located in the DC metropolitan area to examine how fiber-induced effects influence network performance. Quantum networks uniquely leverage quantum phenomena to enable fundamentally secure communication and distributed quantum computing beyond the capabilities of classical systems. To realize these advantages, careful characterization of the quantum physical layer and deployed fiber-based networks is essential, as it ensures the stability, reliability, and high-fidelity operation required for large-scale quantum network applications.

•May 1, 2026•0 citations

A Polarization Preserving, Low Loss Optical Switch for High Dimensional Time Bin QKD

Michael Antesberger, Shoichi Murakami, Philip John Walther +1 more

We present an ultra-low-loss optical switch designed to enable the deterministic generation and measurement of time-bin qudit states for high-dimensional quantum key distribution. Moreover, our optical switch preserves the single photons’ polarization state.

Quantum 2.0 Conference and Exhibition•Jan 1, 2025•0 citations

Generation, characterization, and manipulation of fiber-coupled entangled photons

Kim Fook Lee, Gregory S. Kanter

Systems for generating, manipulating, and measuring entangled photons are described. Quantum state tomographies are recorded with one of the entangled photons distributed over fiber. A high speed, low loss quantum switch for 1550 nm photons is demonstrated, which can manipulate photons for processing or multiplexing.

IEEE/LEOS Summer Topical Meetings•Jul 1, 2017•1 citation
As the field of quantum communications matures and adopts larger network topologies, it will require switches capable of multiplexing and demultiplexing entangled photons between network nodes. Such switches will need to operate at high speeds, with low loss, and minimal signal-band noise, while also retaining the quantum state of the routed photons. We present an all-optical, fiber-based, dual-in, dual-out switch that has a switching window of 45 ps and an insertion loss of <;3.0 dB. In addition, the switch introduces minimal degradation to the quantum state of the routed entangled photons. As a test of the switch's utility, we demultiplex a single quantum channel from a 6.5-GHz dual-channel quantum data stream. The recovered quantum state exhibits a fidelity of 96.2%±1.2% with the prepared state.
Quantum networks exhibit enhanced performance compared to their classical counterparts, enabling secure communication and enhanced sensing protocols. Scalable quantum networks must transmit photons over distances ranging from kilometers to metropolitan scales while preserving entanglement. The objective of this thesis is to characterize the sources and switches of real-world deployed quantum networks, which require an intimate knowledge of nonlinear concepts and devices that drive these operating regimes. Importantly, quantum networks are deployed alongside existing classical communication infrastructure to ensure scalability and compatibility with established fiber-based systems. As a result, quantum and classical signals must coexist within the same telecommunication network. Because quantum infrastructure relies on optical fiber, these networks are susceptible to instabilities arising from fiber- induced effects. To fully realize a scalable quantum network, we investigated the quantum physical layer to optimize performance and identify limitations in our networking system. We characterized the performance of an entangled-photon source used to produce polarization-entangled photons. We then observe how well a high-speed, low-loss quantum switch preserves entanglement, demonstrating its utility for transmitting photons to different nodes in scalable quantum networks. We then analyze a 30 km deployed fiber located in the DC metropolitan area to examine how fiber-induced effects influence network performance. Quantum networks uniquely leverage quantum phenomena to enable fundamentally secure communication and distributed quantum computing beyond the capabilities of classical systems. To realize these advantages, careful characterization of the quantum physical layer and deployed fiber-based networks is essential, as it ensures the stability, reliability, and high-fidelity operation required for large-scale quantum network applications.