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

The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting

Ultrafast coherent measurement of time-bin qubits using chirped-pulse upconversion

John M. Donohue, Megan Agnew, Jonathan Lavoie, Kevin J. Resch

Published Jan 1, 2013• 0 citations
Publisher

Abstract

Using shaped pulses and nonlinear optics, we have experimentally demonstrated coherent measurement of time-bin encoded photons with temporal separations two orders of magnitude smaller than detector resolution by converting timing information to frequency.
DOI
10.1364/qim.2013.w6.48

Related papers

Coherent Ultrafast Measurement of Time-Bin Encoded Photons

John M. Donohue, Megan Agnew, Jonathan Lavoie +1 more

Time-bin encoding is a robust form of optical quantum information, especially for transmission in optical fibers. To readout the information, the separation of the time bins must be larger than the detector time resolution, typically on the order of nanoseconds for photon counters. In the present work, we demonstrate a technique using a nonlinear interaction between chirped entangled time-bin photons and shaped laser pulses to perform projective measurements on arbitrary time-bin states with picosecond-scale separations. We demonstrate a tomographically complete set of time-bin qubit projective measurements and show the fidelity of operations is sufficiently high to violate the Clauser-Horne-Shimony-Holt-Bell inequality by more than 6 standard deviations.

arXiv:1306.1250•Physical Review Letters•Oct 9, 2013•97 citations

Ultrafast Measurement of Femtosecond Time-bin Qubits Using Optimized Up-conversion Single Photon Detector

Yuta Kochi, Sunao Kurimura, Junko Ishi‐Hayase

We developed and optimized the up-conversion single photon detector with the temporal resolution of 415 fs. Consequently, we successfully evaluated single-photon level pseudo time-bin qubits with their pulse interval of only 800 fs.

Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)•Jan 1, 2022•0 citations

Ultrafast Measurement of Femtosecond Time-bin Qubits Using Optimized Up-conversion Single Photon Detector

Yuta Kochi, Sunao Kurimura, Junko Ishi‐Hayase

We developed and optimized the up-conversion single photon detector with the temporal resolution of 415 fs. Consequently, we successfully evaluated single-photon level pseudo time-bin qubits with their pulse interval of only 800 fs.

Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)•Jul 31, 2022•0 citations

Evaluation of Femtosecond Time-bin Qubits Using Frequency Up-conversion Technique

Yuta Kochi, Sunao Kurimura, Junko Ishi‐Hayase

Time-bin qubits, in which quantum information is encoded in a single photon at different times $Δ$t, are suitable for long-distance transmission via optical fibers. However, detection of time-bin qubits has been limited to the nanosecond range owing to the limited temporal resolution of single-photon detectors. In this study, we developed an up-conversion single-photon detector (UCSPD), using commercial nonlinear crystals of different lengths. By changing the crystal length and pump power, we quantitatively evaluated the efficiency and temporal resolution of the UCSPD and determined the optimal conditions for measuring femtosecond time-bin qubits. This detector achieved a temporal resolution of 415 fs and up-conversion efficiency of 10.1 %. Consequently, we successfully evaluated single-photon level pseudo femtosecond time-bin qubits with a pulse interval of only 800 fs.

arXiv:2205.06957•May 14, 2022•2 citations

Quantum applications of ultrafast time-bin encoding

Frédéric Bouchard

The temporal degree of freedom of single photons is a promising avenue for many quantum information tasks. Here, we experimentally investigate the feasibility of time-bin states of light at the picosecond timescale, known as ultrafast time-bin encoding, for applications in quantum communications, quantum simulations, and quantum information processing. With the ability to generate, manipulate, and measure ultrafast time-bin states of light at the single photon level, we enable the use of temporal states of light in a wide range of quantum applications.

Quantum Communications and Quantum Imaging•Sep 18, 2025•0 citations

Measuring ultrafast time-bin qudits

Frédéric Bouchard, Kent Bonsma-Fisher, Khabat Heshami +3 more

Time-bin qudits, which are valued in quantum communication protocols for their efficiency and robustness, are made by encoding information into the relative arrival times of photons. However, their practicality has been limited due to the difficulty of the measurements needed to extract this information. Here, the authors demonstrate an effective experimental technique that uses active and passive optical elements to conduct single-shot measurements of ultrafast four-time-bin qudits.

arXiv:2302.03045•Physical Review A•Feb 22, 2023•21 citations
Time-bin encoding is a robust form of optical quantum information, especially for transmission in optical fibers. To readout the information, the separation of the time bins must be larger than the detector time resolution, typically on the order of nanoseconds for photon counters. In the present work, we demonstrate a technique using a nonlinear interaction between chirped entangled time-bin photons and shaped laser pulses to perform projective measurements on arbitrary time-bin states with picosecond-scale separations. We demonstrate a tomographically complete set of time-bin qubit projective measurements and show the fidelity of operations is sufficiently high to violate the Clauser-Horne-Shimony-Holt-Bell inequality by more than 6 standard deviations.
Time-bin qubits, in which quantum information is encoded in a single photon at different times ΔΔΔt, are suitable for long-distance transmission via optical fibers. However, detection of time-bin qubits has been limited to the nanosecond range owing to the limited temporal resolution of single-photon detectors. In this study, we developed an up-conversion single-photon detector (UCSPD), using commercial nonlinear crystals of different lengths. By changing the crystal length and pump power, we quantitatively evaluated the efficiency and temporal resolution of the UCSPD and determined the optimal conditions for measuring femtosecond time-bin qubits. This detector achieved a temporal resolution of 415 fs and up-conversion efficiency of 10.1 %. Consequently, we successfully evaluated single-photon level pseudo femtosecond time-bin qubits with a pulse interval of only 800 fs.
The temporal degree of freedom of single photons is a promising avenue for many quantum information tasks. Here, we experimentally investigate the feasibility of time-bin states of light at the picosecond timescale, known as ultrafast time-bin encoding, for applications in quantum communications, quantum simulations, and quantum information processing. With the ability to generate, manipulate, and measure ultrafast time-bin states of light at the single photon level, we enable the use of temporal states of light in a wide range of quantum applications.