Generating, manipulating and measuring entanglement and mixture with a reconfigurable photonic circuit

By Peter Shadbolt, M. R. Verde, Alberto Peruzzo, Alberto Politi, Anthony Laing, Mirko Lobino, Jonathan C. F. Matthews, M. G. Thompson, Jeremy Lloyd O'Brien. Nature Photonics, 2011

287 citations recorded by the source corpus.

Entanglement is the quintessential quantum-mechanical phenomenon understood to lie at the heart of future quantum technologies and the subject of fundamental scientific investigations. Mixture, resulting from noise, is often an unwanted result of interaction with an environment, but is also of fundamental interest, and is proposed to play a role in some biological processes. Here, we report an integrated waveguide device that can generate and completely characterize pure two-photon states with any amount of entanglement and arbitrary single-photon states with any amount of mixture. The device consists of a reconfigurable integrated quantum photonic circuit with eight voltage-controlled phase shifters. We demonstrate that, for thousands of randomly chosen configurations, the device performs with high fidelity. We generate maximally and non-maximally entangled states, violate a Bell-type inequality with a continuum of partially entangled states, and demonstrate the generation of arbitrary one-qubit mixed states. Researchers demonstrate a reconfigurable integrated quantum photonic circuit. The device comprises a two-qubit entangling gate, several Hadamard-like gates and eight variable phase shifters. The set-up is used to generate entangled states, violate a Bell-type inequality with a continuum of partially entangled states and demonstrate the generation of arbitrary one-qubit mixed states.

Subfields: Artificial Intelligence

View Paper: https://www.semanticscholar.org/paper/b0445f48f57bda5f24356b41426fd338ac0c7c6f

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Citations in the corpus

Quantum teleportation on a photonic chip (2014, background): “together with active circuit control [12, 13] will be required to identify, and then correct, remaining deviations from design.”
Integrated photonic quantum technologies (2019, methodology): “quantum photonic circuits [19], quantum walks with correlated photons [107], near-optimal two-photon quantum interference [18], the first re-programmable multi-functional quantum processor unit (QPU) [17], integrated TES PNR detector on waveguide [62], Si-waveguide integrated SPSND with high efficie”
On-chip quantum interference between silicon photon-pair sources (2013, background): “Equation (4) describes the Pbunch data well (curves, Fig.”