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

European Quantum Electronics Conference (EQEC)

Long distance entanglement swapping and perspectives for a real quantum relay

Hugues de Riedmatten, I. Marcikic, M. Halder, J. A. W. van Houwelingen, Sébastien Tanzilli, A. Beveratos, Wolfgang Tittel, H. Zbinden, N. Gisin

Published Jan 18, 2006• 0 citations
Publisher

Abstract

Entanglement swapping of time-bin qubits over a distance of 1.1 km was demonstrated. The visibility of the 4-fold coincidences conditioned on a successful Bell state measurement was 75.5%/spl plusmn/5%, clearly indicating that the photons were entangled and could violate Bell inequalities (visibility of 70.7%). This latest results confirm that time-bin encoding is robust enough against several decoherence effects in optical fibers.

DOI
10.1109/eqec.2005.1567482

Related papers

Long-distance entanglement swapping with photons from separated sources

Hugues de Riedmatten, I. Marcikic, J. A. W. van Houwelingen +3 more

We report the experimental realization of entanglement swapping over long distances in optical fibers. Two photons separated by more than $2\phantom{\rule{0.3em}{0ex}}\mathrm{km}$ of optical fibers are entangled, although they never directly interacted. We use two pairs of time-bin entangled qubits created in spatially separated sources and carried by photons at telecommunication wavelengths. A partial Bell-state measurement is performed with one photon from each pair, which projects the two remaining photons, formerly independent onto an entangled state. A visibility high enough to infer a violation of a Bell inequality is reported, after both photons have each traveled through $1.1\phantom{\rule{0.3em}{0ex}}\mathrm{km}$ of optical fiber.

arXiv:quant-ph/0409093•Physical Review A•May 31, 2005•180 citations

Entanglement swapping over 100 km optical fiber with independent entangled photon-pair sources

Qi-Chao Sun, Yang-Fan Jiang, Ya-Li Mao +12 more

Realizing long-distance entanglement swapping with independent sources in the real-world condition is important for both future quantum networks and fundamental study of quantum theory. Currently, entanglement swapping over a few tens of kilometers of underground optical fiber has been achieved. However, future applications demand entanglement swapping over longer distances in more complicated environments. We exploit two independent 1-GHz-clock sequential time-bin entangled photon-pair sources; develop several automatic stability controls; and successfully implement a field test of entanglement swapping over an optical fiber link of more than 100 km, including coiled, underground, and suspended optical fibers. Our result verifies the feasibility of such technologies for long-distance quantum networks and for many interesting quantum information experiments.

Optica•Oct 2, 2017•86 citations

Field test of entanglement swapping over 100-km optical fiber with independent 1-GHz-clock sequential time-bin entangled photon-pair sources

Qi-Chao Sun, Yang-Fan Jiang, Ya-li Mao +12 more

Realizing long distance entanglement swapping with independent sources in the real-world condition is important for both future quantum network and fundamental study of quantum theory. Currently, demonstration over a few of tens kilometer underground optical fiber has been achieved. However, future applications demand entanglement swapping over longer distance with more complicated environment. We exploit two independent 1-GHz-clock sequential time-bin entangled photon-pair sources, develop several automatic stability controls, and successfully implement a field test of entanglement swapping over more than 100-km optical fiber link including coiled, underground and suspended optical fibers. Our result verifies the feasibility of such technologies for long distance quantum network and for many interesting quantum information experiments.

arXiv:1704.03960•Apr 13, 2017•0 citations

Long Distance Quantum Teleportation in a Quantum Relay Configuration

Hugues de Riedmatten, I. Marcikic, Wolfgang Tittel +3 more

A long distance quantum teleportation experiment with a fiber-delayed Bell state measurement (BSM) is reported. The source creating the qubits to be teleported and the source creating the necessary entangled state are connected to the beam splitter realizing the BSM by two 2 km long optical fibers. In addition, the teleported qubits are analyzed after 2.2 km of optical fiber, in another laboratory separated by 55 m. Time-bin qubits carried by photons at 1310 nm are teleported onto photons at 1550 nm. The fidelity is of 77%, above the maximal value obtainable without entanglement. This is the first realization of an elementary quantum relay over significant distances, which will allow an increase in the range of quantum communication and quantum key distribution.

arXiv:quant-ph/0309218•Physical Review Letters•Jan 29, 2004•203 citations

Entanglement distribution over 300 km of fiber

Takahiro Inagaki, Nobuyuki Matsuda, Osamu Tadanaga +2 more

We report the distribution of time-bin entangled photon pairs over 300 km of optical fiber. We realized this by using a high-speed and high signal-to-noise ratio entanglement generation/evaluation setup that consists of periodically poled lithium niobate waveguides and superconducting single photon detectors. The observed two-photon interference fringes exhibited a visibility of 84%. We confirmed the violation of Bell's inequality by 2.9 standard deviations.

arXiv:1310.5473•Optics Express•Sep 24, 2013•198 citations

Long Distance Distribution of Entangled Photon Pair Over 300 km of Fiber

Takahiro Inagaki, Nobuyuki Matsuda, Osamu Tadanaga +3 more

We report the experimental distribution of a time-bin entangled photon pair over 300 km of optical fiber, which is a record for long-distance quantum communication. The observed two-photon interference fringe exhibited a visibility of 84%.

•Jan 1, 2013•2 citations
Entanglement swapping of time-bin qubits over a distance of 1.1 km was demonstrated. The visibility of the 4-fold coincidences conditioned on a successful Bell state measurement was 75.5%/spl plusmn/5%, clearly indicating that the photons were entangled and could violate Bell inequalities (visibility of 70.7%). This latest results confirm that time-bin encoding is robust enough against several decoherence effects in optical fibers.
We report the experimental realization of entanglement swapping over long distances in optical fibers. Two photons separated by more than 2km2\phantom{\rule{0.3em}{0ex}}\mathrm{km}2km of optical fibers are entangled, although they never directly interacted. We use two pairs of time-bin entangled qubits created in spatially separated sources and carried by photons at telecommunication wavelengths. A partial Bell-state measurement is performed with one photon from each pair, which projects the two remaining photons, formerly independent onto an entangled state. A visibility high enough to infer a violation of a Bell inequality is reported, after both photons have each traveled through 1.1km1.1\phantom{\rule{0.3em}{0ex}}\mathrm{km}1.1km of optical fiber.
Realizing long-distance entanglement swapping with independent sources in the real-world condition is important for both future quantum networks and fundamental study of quantum theory. Currently, entanglement swapping over a few tens of kilometers of underground optical fiber has been achieved. However, future applications demand entanglement swapping over longer distances in more complicated environments. We exploit two independent 1-GHz-clock sequential time-bin entangled photon-pair sources; develop several automatic stability controls; and successfully implement a field test of entanglement swapping over an optical fiber link of more than 100 km, including coiled, underground, and suspended optical fibers. Our result verifies the feasibility of such technologies for long-distance quantum networks and for many interesting quantum information experiments.
Realizing long distance entanglement swapping with independent sources in the real-world condition is important for both future quantum network and fundamental study of quantum theory. Currently, demonstration over a few of tens kilometer underground optical fiber has been achieved. However, future applications demand entanglement swapping over longer distance with more complicated environment. We exploit two independent 1-GHz-clock sequential time-bin entangled photon-pair sources, develop several automatic stability controls, and successfully implement a field test of entanglement swapping over more than 100-km optical fiber link including coiled, underground and suspended optical fibers. Our result verifies the feasibility of such technologies for long distance quantum network and for many interesting quantum information experiments.
A long distance quantum teleportation experiment with a fiber-delayed Bell state measurement (BSM) is reported. The source creating the qubits to be teleported and the source creating the necessary entangled state are connected to the beam splitter realizing the BSM by two 2 km long optical fibers. In addition, the teleported qubits are analyzed after 2.2 km of optical fiber, in another laboratory separated by 55 m. Time-bin qubits carried by photons at 1310 nm are teleported onto photons at 1550 nm. The fidelity is of 77%, above the maximal value obtainable without entanglement. This is the first realization of an elementary quantum relay over significant distances, which will allow an increase in the range of quantum communication and quantum key distribution.