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

Characterizing the Temporal Mode of Single-Photon State Generated from Cold Atoms

Zhenjie Gu, Ce Yang, Peng Chen, J. F. Chen

Published Jan 1, 2018• 0 citations
Publisher

Abstract

Single photons with pure temporal state are able to be generated and manipulated in cold atoms. We demonstrate the amplitude and phase of their temporal-mode function are both revealed in homodyne detection of photon currents.
DOI
10.1364/cleopr.2018.th1d.5

Related papers

Quantum interference of single photons with distinguishable paths

Yunxiao Zhang, Liang Cui, Xueshi Guo +4 more

We report a single-photon interference experiment where the interfering paths are in orthogonal polarization and temporal modes. This is achieved through amplitude measurement by homodyne detection so that interference occurs in photo-current after measurement.

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

Temporal pure single photons generated from time-frequency entangled biphotons

Peng Qian, Zhejie Gu, J. F. Chen +1 more

Narrow-band time-frequency entangled biphotons are generated from spontaneous four-wave mixing in cold atom clouds. The coherence time of the entangled biphotons can be extended to sub-microseconds by the slow light effect. The temporal wavefunction of the biphotons can be manipulated through modulating the spectral or spatial mode of the controlling laser beams. Concerning a pair of entangled biphoton and the resulting heralded single photon, it was commonly believed that, time-frequency entanglement damages the temporal purity of the single photon. However, the case is totally different for biphotons with long coherence time which is far beyond the time resolution of single-photondetectors. We demonstrate that, the single photon heralded from these time-frequency entangled biphotons is in a pure temporal state. Therefore, single photons are able to be shaped through the time-frequency entanglement with their partner photons, while the single photons could be found to be still in a pure state and thus useful for quantum information processing and communication technology.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Nov 3, 2016•0 citations

Quantum interference of single photons with distinguishable paths

Yunxiao Zhang, Liang Cui, Xueshi Guo +4 more

We report a single-photon interference experiment where the interfering paths are in orthogonal polarization and temporal modes. This is achieved through amplitude measurement by homodyne detection so that interference occurs in photo-current after measurement.

•Jan 1, 2025•0 citations

Generation and Tomographic Analysis of Temporally-delocalized Single Photons

Alessandro Zavatta, Valentina Parigi, Milena D’Angelo +1 more

We report the experimental coherent delocalization of a single photon between two distinct temporal modes. Dual-mode quantum homodyne tomography is used to analyze the state and test for the violation of a Bell’s-type inequality.

Frontiers in Optics•Jan 1, 2006•0 citations

Temporal Purity and Quantum Interference of Single Photons from Two Independent Cold Atomic Ensembles

Peng Qian, Zhenjie Gu, Rong Cao +4 more

The temporal purity of single photons is crucial to the indistinguishability of independent photon sources for the fundamental study of the quantum nature of light and the development of photonic technologies. Currently, the technique for single photons heralded from time-frequency entangled biphotons created in nonlinear crystals does not guarantee the temporal-quantum purity, except using spectral filtering. Nevertheless, an entirely different situation is anticipated for narrow-band biphotons with a coherence time far longer than the time resolution of a single-photon detector. Here we demonstrate temporally pure single photons with a coherence time of 100 ns, directly heralded from the time-frequency entangled biphotons generated by spontaneous four-wave mixing in cold atomic ensembles, without any supplemented filters or cavities. A near-perfect purity and indistinguishability are both verified through Hong-Ou-Mandel quantum interference using single photons from two independent cold atomic ensembles. The time-frequency entanglement provides a route to manipulate the pure temporal state of the single-photon source.

Physical Review Letters•Jul 1, 2016•41 citations

Photon Temporal Modes as a Complete Framework for Quantum Information

M. G. Raymer, Benjamin Brecht, Dileep V. Reddy +1 more

We propose a quantum information framework that employs field-orthogonality of single-photon temporal modes. The three requirements–generation of resource states, the targeted and efficient manipulation of TMs, and their detection and characterization–can be fulfilled with current technology.

Frontiers in Optics•Jan 1, 2015•1 citation
Narrow-band time-frequency entangled biphotons are generated from spontaneous four-wave mixing in cold atom clouds. The coherence time of the entangled biphotons can be extended to sub-microseconds by the slow light effect. The temporal wavefunction of the biphotons can be manipulated through modulating the spectral or spatial mode of the controlling laser beams. Concerning a pair of entangled biphoton and the resulting heralded single photon, it was commonly believed that, time-frequency entanglement damages the temporal purity of the single photon. However, the case is totally different for biphotons with long coherence time which is far beyond the time resolution of single-photondetectors. We demonstrate that, the single photon heralded from these time-frequency entangled biphotons is in a pure temporal state. Therefore, single photons are able to be shaped through the time-frequency entanglement with their partner photons, while the single photons could be found to be still in a pure state and thus useful for quantum information processing and communication technology.
The temporal purity of single photons is crucial to the indistinguishability of independent photon sources for the fundamental study of the quantum nature of light and the development of photonic technologies. Currently, the technique for single photons heralded from time-frequency entangled biphotons created in nonlinear crystals does not guarantee the temporal-quantum purity, except using spectral filtering. Nevertheless, an entirely different situation is anticipated for narrow-band biphotons with a coherence time far longer than the time resolution of a single-photon detector. Here we demonstrate temporally pure single photons with a coherence time of 100 ns, directly heralded from the time-frequency entangled biphotons generated by spontaneous four-wave mixing in cold atomic ensembles, without any supplemented filters or cavities. A near-perfect purity and indistinguishability are both verified through Hong-Ou-Mandel quantum interference using single photons from two independent cold atomic ensembles. The time-frequency entanglement provides a route to manipulate the pure temporal state of the single-photon source.