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

arXiv:2404.08348 · Physical Review A

Theory of time-bin-entangled photons from quantum emitters

Thomas K. Bracht, Florian Kappe, Moritz Cygorek, Tim Seidelmann, Yusuf Karli, Vikas Remesh, Gregor Weihs, V. M. Axt, Doris E. Reiter

Published Dec 12, 2024• 6 citations
arXivHTMLPDF

Abstract

The authors present the tools needed to calculate the density matrices for time-bin encoded photon pairs. Their formalism is ready to account for realistic loss or decoherence processes, allowing for better assessment of the feasibility of different entangled-pair-production schemes.
DOI
10.1103/physreva.110.063709

Related papers

Entanglement generation in semiconductor nanostructures

Laia Ginés, Junior R. Gonzales-Ureta, Magdalena Moczała-Dusanowska +4 more

Single self-assembled quantum dots are established emitters of single photons and entangled photon pairs. The entanglement of photons generated by quantum dots has been shown in polarization [1] , in time bin [2] , and also as hyperentanglement [3] . However, the achievable degree of entanglement and readiness of the source for use in quantum communication protocols, depend on several additional functionalities such as high collection efficiency, coherence of the emitted photon pairs, and fabrication scalability.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 21, 2021•0 citations

Decoherence in Waveguide Quantum Electrodynamics using Matrix Product States

Matias Bundgaard-Nielsen, Matthew Kozma, Sofia Arranz Regidor +1 more

We present a matrix product state (MPS) method for including decoherence processes in calculations involving waveguide quantum electrodynamics (waveguide QED) using density matrices. The approach is based on collision quantum optics, where the many-body state of the waveguide is represented using discrete time bins, which are then efficiently encoded using an MPS chain. Our method is a generalization of previous MPS methods, and we demonstrate how one can efficiently extend the method to density matrices, allowing for the inclusion of various loss processes in the form of Lindblad terms in the Liouvillian superoperator responsible for the relevant dissipation dynamics. As an application of the theory, we study various waveguide QED systems and the influence of emitter pure dephasing (which is one of the most important processes in real systems) on the light-matter interactions, including a two-level system (TLS) in a semi-infinite waveguide with time-delayed feedback, two spatially separated TLSs with finite delays, and finally the scattering of few-photon Fock pulses on a TLS. In addition to emitter pure dephasing, we also show how to include off-chip radiative decay, and show how it differs qualitatively from pure dephasing.

quant-pharXiv:2604.18036•Physical Review Research•Apr 21, 2026•1 citation

Polarization/Time-bin basis conversion of entangled photons

J. S. Hodges, Stephen Pappas, Yaakov S. Weinstein +1 more

We describe a scheme for interconverting photonic entanglement between time-bin and polarization bases. This scheme makes entangled pairs insensitive to birefringement effects and thus has application in fiber-based quantum memories.

Conference on Lasers and Electro-Optics•Jan 1, 2012•1 citation

Effective Density Matrices in Entangled Photon Detection

Taman Truong, Christian Arenz, Joseph M. Lukens

We develop a practical, mathematical model for the effective two-photon density matrix produced by a parametric source of entangled photon pairs under two and four photon-number-resolving and threshold detectors.

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

Long-range distribution of high-quality time-bin entangled photons for quantum communication

Jin-Hun Kim, Jin-Woo Chae, Youn-Chang Jeong +1 more

Journal of the Korean Physical Society•Dec 15, 2021•7 citations

Frequency-Time Multiplexing for Near-Deterministic Generation of n-Photon Frequency-Bin States

Alex Fischer, Nathan T. Arnold, Colin P. Lualdi +5 more

One of the primary challenges of photonic quantum information processing is the on-demand preparation of multiple single-photon-level quantum states from probabilistic photon pair sources. Motivated by recent developments in frequency-bin-encoded photonic quantum information processing, here we consider active time multiplexing to generate n-photon states, where n single photons with n distinct frequencies occupy the same spatiotemporal mode. We devise an approach that uses optical quantum memories to manipulate the temporal mode of heralded single photons and an array of fiber Bragg grating reflectors to jointly manipulate the frequency and temporal modes of the photons, overlapping n photons in n separate frequency bins into a single spatiotemporal mode. We calculate multiphoton state generation rates that, accounting for loss, are realistically achievable with commercially available hardware. Using only a single free-space switchable delay loop for an optical quantum memory, this scheme could feasibly produce 8-photon states at an average rate of 1 kHz.

quant-pharXiv:2603.03576•Mar 5, 2026•1 citation
Single self-assembled quantum dots are established emitters of single photons and entangled photon pairs. The entanglement of photons generated by quantum dots has been shown in polarization [1] , in time bin [2] , and also as hyperentanglement [3] . However, the achievable degree of entanglement and readiness of the source for use in quantum communication protocols, depend on several additional functionalities such as high collection efficiency, coherence of the emitted photon pairs, and fabrication scalability.
We present a matrix product state (MPS) method for including decoherence processes in calculations involving waveguide quantum electrodynamics (waveguide QED) using density matrices. The approach is based on collision quantum optics, where the many-body state of the waveguide is represented using discrete time bins, which are then efficiently encoded using an MPS chain. Our method is a generalization of previous MPS methods, and we demonstrate how one can efficiently extend the method to density matrices, allowing for the inclusion of various loss processes in the form of Lindblad terms in the Liouvillian superoperator responsible for the relevant dissipation dynamics. As an application of the theory, we study various waveguide QED systems and the influence of emitter pure dephasing (which is one of the most important processes in real systems) on the light-matter interactions, including a two-level system (TLS) in a semi-infinite waveguide with time-delayed feedback, two spatially separated TLSs with finite delays, and finally the scattering of few-photon Fock pulses on a TLS. In addition to emitter pure dephasing, we also show how to include off-chip radiative decay, and show how it differs qualitatively from pure dephasing.
One of the primary challenges of photonic quantum information processing is the on-demand preparation of multiple single-photon-level quantum states from probabilistic photon pair sources. Motivated by recent developments in frequency-bin-encoded photonic quantum information processing, here we consider active time multiplexing to generate n-photon states, where n single photons with n distinct frequencies occupy the same spatiotemporal mode. We devise an approach that uses optical quantum memories to manipulate the temporal mode of heralded single photons and an array of fiber Bragg grating reflectors to jointly manipulate the frequency and temporal modes of the photons, overlapping n photons in n separate frequency bins into a single spatiotemporal mode. We calculate multiphoton state generation rates that, accounting for loss, are realistically achievable with commercially available hardware. Using only a single free-space switchable delay loop for an optical quantum memory, this scheme could feasibly produce 8-photon states at an average rate of 1 kHz.