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

Quantum 2.0 Conference and Exhibition

Towards Interconnecting Cold-Atom Interfaces using an Infrared Free-Space Quantum Link

Samet Demircan, Rishikesh Gokhale, Guodong Cui, Justine Haupt, Ivy Huang, Paul Stankus, Dimitrios Katramatos, Eden V. Figueroa

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We report on our progress towards establishing a 20 km free-space quantum communication link connecting two cold-atom quantum light-matter interfaces across the Stony Brook University (SBU) and Brookhaven National Laboratory (BNL) campuses.
DOI
10.1364/quantum.2024.qth3a.34

Related papers

Development of a 20km Free Space Optical Link for Single-Photon Transmission

Rishikesh Gokhale, Justine Haupt, Eden V. Figueroa +1 more

Presenting the development of the prototype for a 20km Free space quantum optical link between Stony Brook University and Brookhaven National Laboratory and summary of the future efforts and improvements to the experimental setup.

Quantum 2.0 Conference and Exhibition•Jan 1, 2023•0 citations

Developing a layered quantum-capable internet

Leonardo Castillo-Veneros, Dounan Du, Guodong Cui +7 more

We are currently developing a long-baseline quantum network in Long Island, New York. We have communicated quantum memories over a 158km network between Stony Brook and Brookhaven. Here we present the quantum enabling tools necessary to construct a quantum capable internet.

Quantum 2.0 Conference and Exhibition•Jan 1, 2022•0 citations

A long-distance quantum-capable internet testbed

Dounan Du, Leonardo Castillo-Veneros, Dillion Cottrill +5 more

Building a Quantum Internet requires the development of innovative quantum-enabling networking architectures that integrate advanced communication systems with long-distance quantum communication hardware. Here, we present the implementation of a quantum-enabled internet prototype using a novel physics-centric stack-based quantum network paradigm to govern the dynamics of multiple light-matter Hamiltonians across distant nodes. We demonstrate this concept using a deployed large-scale intercity quantum network connecting laboratories at Stony Brook University and the Brookhaven National Laboratory. This network facilitates a fundamental long-distance quantum network service -that of high-visibility Hong-Ou-Mandel interference of telecom quantum states generated in two independent, telecom-compatible quantum light-matter interfaces separated by a distance of 158 km.

arXiv:2101.12742•Jan 29, 2021•9 citations

Quantum Communication in Space

Rupert Ursin, Dominique Elser

I will present recent feasibility studies demonstrating quantum communication on ground, over a 140 km free-space link as well as studies proving the feasibility to perform such kind of experiments in space.

Frontiers in Optics•Jan 1, 2014•1 citation

Automatic Optical Fiber Alignment for a Free Space Optical Link

Aimee Linebarger, Justine Haupt

An underground fiber-based quantum network currently connects Brookhaven National Laboratory and Stony Brook University. Brookhaven's goal is to enhance the network by developing a system to detect or distribute single entangled photons across a 21-km free space optical link. Since the new link is through free space, it uses telescopes instead of fibers. The light sent through the system must couple to a single mode fiber whose opening is only 5 microns in diameter. The beam, having been corrected for atmospheric effects by an adaptive optics system, will have residual drift over time that must be corrected for continuously, and thus a precise and automatic fiber alignment system is needed as part of the active optics system. An alignment algorithm was developed, which will adjust the optical fiber using a three-axis translation stage, controlled by a piezo controller attached to a Raspberry Pi. Testing was conducted in the Instrumentation Division at Brookhaven. This automatic alignment system was also used for a quantum astrometry experiment at the Center for High Angular Resolution Astronomy Array at Mount Wilson, California. The final system consisted of a coarse alignment algorithm that attempted to find the focal point of a fiber coupling lens mathematically by scanning cross sections of the beam's intensity, and a fine alignment algorithm that searched a small volume of points around the previously calculated point. The automated system was as good at finding best focus as a human, and achieved a coupling efficiency greater than 50%, which was the desired outcome.

IEEE MIT Undergraduate Research Technology Conference (URTC)•Oct 10, 2025•0 citations

Remote interfacing between superconducting qubits and Rydberg-atom qubits via thermal coupled cavities

Zhen-Tao Liang, Guo-Qing Zhang, Jianhao Yuan +5 more

Science China Physics Mechanics and Astronomy•Mar 3, 2022•3 citations
Building a Quantum Internet requires the development of innovative quantum-enabling networking architectures that integrate advanced communication systems with long-distance quantum communication hardware. Here, we present the implementation of a quantum-enabled internet prototype using a novel physics-centric stack-based quantum network paradigm to govern the dynamics of multiple light-matter Hamiltonians across distant nodes. We demonstrate this concept using a deployed large-scale intercity quantum network connecting laboratories at Stony Brook University and the Brookhaven National Laboratory. This network facilitates a fundamental long-distance quantum network service -that of high-visibility Hong-Ou-Mandel interference of telecom quantum states generated in two independent, telecom-compatible quantum light-matter interfaces separated by a distance of 158 km.
An underground fiber-based quantum network currently connects Brookhaven National Laboratory and Stony Brook University. Brookhaven's goal is to enhance the network by developing a system to detect or distribute single entangled photons across a 21-km free space optical link. Since the new link is through free space, it uses telescopes instead of fibers. The light sent through the system must couple to a single mode fiber whose opening is only 5 microns in diameter. The beam, having been corrected for atmospheric effects by an adaptive optics system, will have residual drift over time that must be corrected for continuously, and thus a precise and automatic fiber alignment system is needed as part of the active optics system. An alignment algorithm was developed, which will adjust the optical fiber using a three-axis translation stage, controlled by a piezo controller attached to a Raspberry Pi. Testing was conducted in the Instrumentation Division at Brookhaven. This automatic alignment system was also used for a quantum astrometry experiment at the Center for High Angular Resolution Astronomy Array at Mount Wilson, California. The final system consisted of a coarse alignment algorithm that attempted to find the focal point of a fiber coupling lens mathematically by scanning cross sections of the beam's intensity, and a fine alignment algorithm that searched a small volume of points around the previously calculated point. The automated system was as good at finding best focus as a human, and achieved a coupling efficiency greater than 50%, which was the desired outcome.