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 European Physical Journal Special Topics

Announcing single photons from imperfect sources by means of “interaction-free" measurements

Thomas Konrad, Artur Scherer, Michael Nock, Jürgen Audretsch

Published May 20, 2008• 0 citations
Publisher
DOI
10.1140/epjst/e2008-00697-7

Related papers

Protecting single-photon entanglement with imperfect single-photon source

Yang Ou-Yang, Zhao-Feng Feng, Lan Zhou +1 more

Quantum Information Processing•Nov 26, 2014•17 citations

Perfectly indistinguishable photons with imperfect single photon sources

F. H. B. Somhorst, Boy Kite Sauër, S. N. van den Hoven +1 more

•Nov 19, 2024•0 citations

Production of heralded pure single photons from imperfect sources using cross-phase-modulation

Thomas Konrad, Michael Nock, Artur Scherer +1 more

Realistic single-photon sources do not generate single photons with certainty. Instead they produce statistical mixtures of photons in Fock states $\ensuremath{\mid}1⟩$ and vacuum (noise). We describe how to eliminate the noise in the output of the sources by means of another noisy source or a coherent state and cross-phase-modulation (XPM). We present a scheme that announces the production of pure single photons and thus eliminates the vacuum contribution. This is done by verifying a XPM-related phase shift with a Mach-Zehnder interferometer.

arXiv:quant-ph/0602225•Physical Review A•Sep 25, 2006•7 citations

Heralded single-photon generation using imperfect single-photon sources and a two-photon-absorbing medium

Thomas Konrad, Artur Scherer, Michael Nock +1 more

We propose a setup for a heralded, i.e., announced generation of a pure single-photon state given two imperfect sources whose outputs are represented by mixtures of the single-photon Fock state $\ensuremath{\mid}1⟩$ with the vacuum $\ensuremath{\mid}0⟩$. Our purification scheme uses beam splitters, photodetection, and a two-photon-absorbing medium. The admixture of the vacuum is fully eliminated. We discuss two potential realizations of the scheme.

arXiv:quant-ph/0510113•Physical Review A•Mar 21, 2006•7 citations

The quest for a perfect single-photon source

Michael E. Reimer, Catherine Cher

Nature Photonics•Oct 25, 2019•31 citations

Conditional Production of Schroedinger Cat States with Inefficient Photon Detection

Austin P. Lund, Hyunseok Jeong, Timothy C. Ralph +1 more

It is shown that a linear superposition of two macroscopically distinguishable optical coherent states (Schroedinger's cat state) can be generated using a single photon source and simple all-optical operations. Weak squeezing on a single photon, beam mixing with an auxiliary coherent state, and photon detecting with imperfect threshold detectors are enough to generate a free propagating optical cat state with a large coherent amplitude ($\\alpha>2$) and high fidelity ($F>0.99$). In contrast to all previous schemes to generate such a state, our scheme does not need photon resolving measurements nor Kerr-type nonlinear interactions.

•Dec 31, 2003•0 citations
Realistic single-photon sources do not generate single photons with certainty. Instead they produce statistical mixtures of photons in Fock states $\ensuremath{\mid}1⟩$ and vacuum (noise). We describe how to eliminate the noise in the output of the sources by means of another noisy source or a coherent state and cross-phase-modulation (XPM). We present a scheme that announces the production of pure single photons and thus eliminates the vacuum contribution. This is done by verifying a XPM-related phase shift with a Mach-Zehnder interferometer.
It is shown that a linear superposition of two macroscopically distinguishable optical coherent states (Schroedinger's cat state) can be generated using a single photon source and simple all-optical operations. Weak squeezing on a single photon, beam mixing with an auxiliary coherent state, and photon detecting with imperfect threshold detectors are enough to generate a free propagating optical cat state with a large coherent amplitude (alpha>2\\alpha>2alpha>2) and high fidelity (F>0.99F>0.99F>0.99). In contrast to all previous schemes to generate such a state, our scheme does not need photon resolving measurements nor Kerr-type nonlinear interactions.