Adeline Orieux | LIP6 - Équipe QI

Active engineering of four-wave mixing spectral correlations in multiband hollow-core fibers

Mon, 01 Apr 2019 00:00:00 +0000

We demonstrate theoretically and experimentally a high level of control of the four-wave mixing process in an inert gas–filled inhibited-coupling guiding hollow-core photonic crystal fiber. The specific multiple-branch dispersion profile in such fibers allows both correlated and separable bi-photon states to be produced. By controlling the choice of gas and its pressure and the fiber length, we experimentally generate various joint spectral intensity profiles in a stimulated regime that is transferable to the spontaneous regime. The generated profiles may cover both spectrally separable and correlated bi-photon states and feature frequency tuning over tens of THz, demonstrating a large dynamic control that will be very useful when implemented in the spontaneous regime as a photon pair source.

Engineering four-wave mixing spectral entanglement in hollow-core fibers

Mon, 15 Oct 2018 00:00:00 +0000

Utilisation de fibres à couplage inhibé pour le controle de l'intrication spectrale de paires de photons

Tue, 03 Jul 2018 00:00:00 +0000

Shaping photon-pair time-frequency correlations in inhibited-coupling hollow-core fibers

Mon, 21 May 2018 00:00:00 +0000

Shaping photon-pairs time-frequency correlations in inhibited-coupling hollow-core fibers

Sun, 13 May 2018 00:00:00 +0000

We experimentally show how multiband dispersion properties of inhibited-coupling hollow-core fibers allow to control the spectral correlations of photon pairs generated through four-wave-mixing in a fiber filled with non-linear gas.

Experimental detection of steerability in Bell local states with two measurement settings

Tue, 13 Mar 2018 00:00:00 +0000

Steering, a quantum property stronger than entanglement but weaker than non-locality in the quantum correlation hierarchy, is a key resource for one-sided device-independent quantum key distribution applications, in which only one of the communicating parties is trusted. A fine-grained steering inequality was introduced in [PRA 90 050305(R) (2014)], enabling for the first time the detection of steering in all steerable two-qubit Werner states using only two measurement settings. Here we numerically and experimentally investigate this inequality for generalized Werner states and successfully detect steerability in a wide range of two-photon polarization-entangled Bell local states generated by a parametric down-conversion source.

Experimental investigation of practical unforgeable quantum money

Mon, 01 Jan 2018 00:00:00 +0000

Wiesner’s unforgeable quantum money scheme is widely celebrated as the first quantum information application. Based on the no-cloning property of quantum mechanics, this scheme allows for the creation of credit cards used in authenticated transactions offering security guarantees impossible to achieve by classical means. However, despite its central role in quantum cryptography, its experimental implementation has remained elusive because of the lack of quantum memories and of practical verification techniques. Here, we experimentally implement a quantum money protocol relying on classical verification that rigorously satises the security condition for unforgeability. Our system exploits polarization encoding of weak coherent states of light and operates under conditions that ensure compatibility with state-of-the-art quantum memories. We derive working regimes for our system using a security analysis taking into account all practical imperfections. Our results constitute a major step towards a real-world realization of this milestone protocol.