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

Physical Review

Projective production of path-entangled photon number states with linear optics

Jonathan P. Dowling, H. Lee, Pieter Kok, Nicolas J. Cerf

Published Jan 1, 2001• 0 citations
OpenAlex

Abstract

Propose a method for preparing path entangled states with a definite photon number larger than two that relies on projective measurements.

Related papers

Generating Multimode Entangled States of Light by Linear Optics and Photocounting

Pavel Lougovski, Dmitry B. Uskov, Jonathan P. Dowling

We develop analytic and numerical schemes for generating multimode photon entangled states using linear optics and projective measurement with applications to linear optical quantum computing and quantum lithography.

Frontiers in Optics•Jan 1, 2006•0 citations

Generation of multi-photon entangled states by using linear optical elements and a projective measurement

X.-B. Zou, K. Pahlke, Wolfgang M. Mathis

Physics Letters A•Dec 1, 2002•2 citations

Linear optics and projective measurements alone suffice to create large-photon-number path entanglement

Hwang Lee, Pieter Kok, Nicolas J. Cerf +1 more

We propose a method for preparing maximal path entanglement with a definite photon-number N, larger than two, using projective measurements. In contrast with the previously known schemes, our method uses only linear optics. Specifically, we exhibit a way of generating four-photon, path-entangled states of the form $|4,0〉+|0,4〉,$ using only four beam splitters and two detectors. These states are of major interest as a resource for quantum interferometric sensors as well as for optical quantum lithography and quantum holography.

arXiv:quant-ph/0109080•Physical Review A•Mar 1, 2002•130 citations

Scheme for linear optical preparation of a type of four-photon entangled state with conventional photon detectors

Hao Wang, Shou Zhang

The European Physical Journal D•Apr 28, 2009•23 citations

Linear optics with projective measurements for fun and profit

Pieter Kok, Hwang Lee, Colin P. Williams +1 more

The technique of projective measurements in linear optics can provide apparent, efficient nonlinear interaction between photons, which is technically problematic otherwise. We present an application of such a technique to prepare large photon-number path entanglement. Large photon-number path entanglement is an important resource for Heisenberg-limited optical interferometry, where the sensitivity of phase measurements can be improved beyond the usual shot-noise limit. A similar technique can also be applied to signal the presence of a single photon without destroying it. We further show how to build a quantum repeater for long-distance quantum communication.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•May 9, 2003•0 citations

Quantum random number generator using photon-number path entanglement

Osung Kwon, Young‐Wook Cho, Yoon-Ho Kim

We report an experimental implementation of quantum random number generator based on the photon-number-path entangled state. The photon-number-path entangled state is prepared by means of two-photon Hong-Ou-Mandel quantum interference at a beam splitter. The randomness in our scheme is of truly quantum mechanical origin as it comes from the projection measurement of the entangled two-photon state. The generated bit sequences satisfy the standard randomness test.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jul 29, 2010•9 citations
We propose a method for preparing maximal path entanglement with a definite photon-number N, larger than two, using projective measurements. In contrast with the previously known schemes, our method uses only linear optics. Specifically, we exhibit a way of generating four-photon, path-entangled states of the form ∣4,0〉+∣0,4〉,|4,0〉+|0,4〉,∣4,0〉+∣0,4〉, using only four beam splitters and two detectors. These states are of major interest as a resource for quantum interferometric sensors as well as for optical quantum lithography and quantum holography.
The technique of projective measurements in linear optics can provide apparent, efficient nonlinear interaction between photons, which is technically problematic otherwise. We present an application of such a technique to prepare large photon-number path entanglement. Large photon-number path entanglement is an important resource for Heisenberg-limited optical interferometry, where the sensitivity of phase measurements can be improved beyond the usual shot-noise limit. A similar technique can also be applied to signal the presence of a single photon without destroying it. We further show how to build a quantum repeater for long-distance quantum communication.