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

International Conference on Quantum Information

Measurements of Phase Correlations between Polarization Entangled Photons

Enrique J. Galvez, Mehul Malik, B. C. Melius, Bryce Gadway, Ushnish Ray

Published Jan 1, 2007• 0 citations
Publisher

Abstract

Correlated photon pairs going in different directions were prepared in a polarization-entangled Bell state. Each photon passed through a Pancharatnam phase shifter and polarizer. We measured the correlations as a function of the inserted phases.
DOI
10.1364/icqi.2007.jwc46

Related papers

Phase-Shifted Bell States

Carey L. Jackman, Paul Werbos, Maarten D. Hoogerland +2 more

Abstract - We prepare a system of two photons in phase shifted entangled states by setting a quarter wave plate on one path to angles different than 0 or 90 degrees, thereby phase-shifting part of the entangled photon states. We report the results of polarization correlation experiments with some intriguing questions about how to interpret them, with future possible application in quantum information, communication and computation.

•Oct 1, 2025•0 citations

Polarization Entanglement Converted from Spatially Correlated Photon Pairs

Ryōsuke Shimizu, T. Yamaguchi, Yasuyoshi Mitsumori +2 more

We propose and demonstrate a novel scheme for the generation of polarization entanglement from spatially correlated photon pairs generated by parametric down-conversion. Using the state, we also demonstrate the violation of Bell's inequality.

The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting•Jan 1, 2007•0 citations

Phase shifting of an interferometer using nonlocal quantum-state correlations

Enrique J. Galvez, Mehul Malik, B. C. Melius

We describe an experiment where the phase and amplitude of the interference pattern of light going through an interferometer was varied by doing operations on quantum-correlated light that did not go through the interferometer. This was accomplished by sending a pair of polarization-entangled photons in separate directions, one to an interferometer and the other one to a phase shifter, in principle in a remote location. The interferometer was set up to put the state of the pair in a superposition of maximally entangled states. The phase shifter inserted a phase between the product-state components that made up each entangled state. Polarizers located before the detectors projected the quantum state of the light. As a result, the phase and amplitude of the interference pattern were varied by changing the settings of the phase shifter and polarizer in the path of the photon in the remote location.

Physical Review A•Feb 15, 2007•12 citations

Transfer of quantum correlations from one-photon systems to entangled two-photon systems

Anand K. Jha

This talk will go through the basics of coherence and two-particle entanglement and will present some of our work related to how quantum correlations from one-photon systems get transferred to entangled two-photon systems.

International conference on fiber optics and photonics•Jan 1, 2016•0 citations

Optical-Fiber Source of Polarization-Entangled Photons in the 1550 nm Telecom Band

Xiaoying Li, Paul L. Voss, Jay E. Sharping +1 more

We present a fiber-based source of polarization-entangled photons that is well suited for quantum communication applications in the 1550 nm band of standard fiber-optic telecommunications. Polarization entanglement is created by pumping a nonlinear-fiber Sagnac interferometer with two time-delayed orthogonally polarized pump pulses and subsequently removing the time distinguishability by passing the parametrically scattered signal and idler photon pairs through a piece of birefringent fiber. Coincidence detection of the signal and idler photons yields biphoton interference with visibility greater than 90%, while no interference is observed in direct detection of either signal or idler photons. All four Bell states can be prepared with our setup and we demonstrate violations of the Clauser-Horne-Shimony-Holt form of Bell's inequality by up to 10 standard deviations of measurement uncertainty.

arXiv:quant-ph/0402191•Physical Review Letters•Feb 9, 2005•454 citations

Bell states within the linewidth of SPDC and applications

Marco Genovese, G. Brida, Valentina Caricato +6 more

In this paper we review our recent works on the generation of different Bell states within the lineshape of parametric down-conversion (SPDC) and their possible applications. Indeed, for polarization-entangled two-photon states produced via SPDC, the frequency-angular lineshape allowed by phase matching is considered. It is shown that there are always different Bell states generated for different mismatch values within the natural bandwidth. Consideration is made for two different methods of polarization entanglement preparation, based on type-II SPDC and on SPDC in two type-I crystals producing orthogonally polarized photon pairs. Different Bell states can be filtered out by either frequency selection or angular selection, or both. Our theoretical calculations are confirmed by a series of experiments, performed for the two above-mentioned ways of producing polarization-entangled photon pairs and with two kinds of measurements: frequency-selective and angular-selective. Finally, we mention possible application to quantum communication with fibers.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Sep 11, 2007•0 citations
We describe an experiment where the phase and amplitude of the interference pattern of light going through an interferometer was varied by doing operations on quantum-correlated light that did not go through the interferometer. This was accomplished by sending a pair of polarization-entangled photons in separate directions, one to an interferometer and the other one to a phase shifter, in principle in a remote location. The interferometer was set up to put the state of the pair in a superposition of maximally entangled states. The phase shifter inserted a phase between the product-state components that made up each entangled state. Polarizers located before the detectors projected the quantum state of the light. As a result, the phase and amplitude of the interference pattern were varied by changing the settings of the phase shifter and polarizer in the path of the photon in the remote location.
We present a fiber-based source of polarization-entangled photons that is well suited for quantum communication applications in the 1550 nm band of standard fiber-optic telecommunications. Polarization entanglement is created by pumping a nonlinear-fiber Sagnac interferometer with two time-delayed orthogonally polarized pump pulses and subsequently removing the time distinguishability by passing the parametrically scattered signal and idler photon pairs through a piece of birefringent fiber. Coincidence detection of the signal and idler photons yields biphoton interference with visibility greater than 90%, while no interference is observed in direct detection of either signal or idler photons. All four Bell states can be prepared with our setup and we demonstrate violations of the Clauser-Horne-Shimony-Holt form of Bell's inequality by up to 10 standard deviations of measurement uncertainty.
In this paper we review our recent works on the generation of different Bell states within the lineshape of parametric down-conversion (SPDC) and their possible applications. Indeed, for polarization-entangled two-photon states produced via SPDC, the frequency-angular lineshape allowed by phase matching is considered. It is shown that there are always different Bell states generated for different mismatch values within the natural bandwidth. Consideration is made for two different methods of polarization entanglement preparation, based on type-II SPDC and on SPDC in two type-I crystals producing orthogonally polarized photon pairs. Different Bell states can be filtered out by either frequency selection or angular selection, or both. Our theoretical calculations are confirmed by a series of experiments, performed for the two above-mentioned ways of producing polarization-entangled photon pairs and with two kinds of measurements: frequency-selective and angular-selective. Finally, we mention possible application to quantum communication with fibers.