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

Synthesizing Single-Photon Space-Time Wave Packets

Bryan L. Turo, Bahaa E. A. Saleh, Ayman F. Abouraddy

Published Jan 1, 2025• 0 citations
Publisher

Abstract

We demonstrate the first spatiotemporally structured single-photon wave packets starting from generic entangled photon pairs. We confirm the diffraction-free propagation and novel non-local spatiotemporal spectral correlations between the photon-pair.
DOI
10.1364/cleo_at.2025.jps200_178

Related papers

Observation of Self-Healing in Single-Photon Space-Time Wave Packets

Bryan L. Turo, Bahaa E. A. Saleh, Ayman F. Abouraddy

We demonstrate experimentally the self-healing of spatiotemporally structured single-photon wave packets. After traversing an opaque obstruction, the single-photon spatial profile (from an entangled-photon pair) is rapidly reconstituted, which may be useful for resilient quantum communication.

•Jan 1, 2025•0 citations

Quantum teleportation with a single-photon wave packet

S. N. Molotkov

A scheme of energy—time quantum teleportation using an entangled photon pair is proposed. The teleportation of a multimode state of a single-photon wave packet is investigated theoretically.

Russian Microelectronics•Jan 1, 2006•0 citations

Tailored Photon-Pair Generation in Optical Fibers

Offir Cohen, Jeff S. Lundeen, Brian J. Smith +3 more

We experimentally control the spectral structure of photon pairs created via spontaneous four-wave mixing in microstructured fibers. By fabricating fibers with designed dispersion, one can manipulate the photons' wavelengths, joint spectrum, and, thus, entanglement. As an example, we produce photon pairs with no spectral correlations, allowing direct heralding of single photons in pure-state wave packets without filtering. We achieve an experimental purity of (85.9+/-1.6)%, while theoretical analysis and preliminary tests suggest that 94.5% purity is possible with a much longer fiber.

arXiv:0809.0071•Physical Review Letters•Mar 27, 2009•183 citations

Local and remote synthesis of single-photon space-time wave packets

Bryan L. Turo, Bahaa E. A. Saleh, Ayman F. Abouraddy

Space-time wave packets (STWPs) are a new class of spatiotemporally structured light fields that are endowed with a host of unique properties, including diffraction-free propagation at controllable group velocity, self-healing, and dispersion-free propagation in dispersive media. These characteristics make STWPs useful candidates for free-space optical communications, particularly for quantum communications. We demonstrate here the first single-photon STWP produced in two different configurations from entangled-photon pairs produced through spontaneous parametric downconversion. In the first configuration, a spatiotemporal spectral modulator is placed in the path of the signal photon, whose arrival is heralded by detection of the idler photon, which we refer to as local STWP synthesis. In the second configuration, the signal photon after the modulator is detected to herald the arrival of the idler photon, which we refer to as remote STWP preparation. In both configurations, we observe the predicted diffraction-free propagation of single-photon STWPs. These results pave the way for quantum communications using spatiotemporally structured quantum states of light.

Complex Light and Optical Forces•Mar 5, 2026•0 citations

Spatiotemporal single-photon Airy wavepackets

Jianmin Wang, Ying Zuo, Xingchang Wang +3 more

We have demonstrated for the first time spatiotemporal nonspreading quantum Airy photons with long coherence times by merging quantum optics in cold atomic ensembles and nondiffracting spatial photonics.

Frontiers in Optics•Jan 1, 2023•0 citations

Huygens-Fresnel-Kirchhoff construction for quantum propagators with application to diffraction in space and time

Arseni Goussev

We address the phenomenon of diffraction of nonrelativistic matter waves on openings in absorbing screens. To this end, we expand the full quantum propagator, connecting two points on the opposite sides of the screen, in terms of the free particle propagator and spatiotemporal properties of the opening. Our construction, based on the Huygens-Fresnel principle, describes the quantum phenomena of diffraction in space and diffraction in time, as well as the interplay between the two. We illustrate the method by calculating diffraction patterns for localized wave packets passing through various time-dependent openings in one and two spatial dimensions.

arXiv:1201.1389•Physical Review A•Jan 18, 2012•20 citations
We experimentally control the spectral structure of photon pairs created via spontaneous four-wave mixing in microstructured fibers. By fabricating fibers with designed dispersion, one can manipulate the photons' wavelengths, joint spectrum, and, thus, entanglement. As an example, we produce photon pairs with no spectral correlations, allowing direct heralding of single photons in pure-state wave packets without filtering. We achieve an experimental purity of (85.9+/-1.6)%, while theoretical analysis and preliminary tests suggest that 94.5% purity is possible with a much longer fiber.
Space-time wave packets (STWPs) are a new class of spatiotemporally structured light fields that are endowed with a host of unique properties, including diffraction-free propagation at controllable group velocity, self-healing, and dispersion-free propagation in dispersive media. These characteristics make STWPs useful candidates for free-space optical communications, particularly for quantum communications. We demonstrate here the first single-photon STWP produced in two different configurations from entangled-photon pairs produced through spontaneous parametric downconversion. In the first configuration, a spatiotemporal spectral modulator is placed in the path of the signal photon, whose arrival is heralded by detection of the idler photon, which we refer to as local STWP synthesis. In the second configuration, the signal photon after the modulator is detected to herald the arrival of the idler photon, which we refer to as remote STWP preparation. In both configurations, we observe the predicted diffraction-free propagation of single-photon STWPs. These results pave the way for quantum communications using spatiotemporally structured quantum states of light.
We address the phenomenon of diffraction of nonrelativistic matter waves on openings in absorbing screens. To this end, we expand the full quantum propagator, connecting two points on the opposite sides of the screen, in terms of the free particle propagator and spatiotemporal properties of the opening. Our construction, based on the Huygens-Fresnel principle, describes the quantum phenomena of diffraction in space and diffraction in time, as well as the interplay between the two. We illustrate the method by calculating diffraction patterns for localized wave packets passing through various time-dependent openings in one and two spatial dimensions.