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

  title={Generating, manipulating and measuring entanglement and mixture with a reconfigurable photonic circuit},
  author={Peter J. Shadbolt and Maria Rodas Verde and Alberto Peruzzo and Alberto Politi and Anthony Laing and Mirko Lobino and Jonathan C. F. Matthews and Mark G. Thompson and Jeremy Lloyd O'Brien},
  journal={Nature Photonics},
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. 
Demonstration of a characterisation protocol for two-qubit Hamiltonians on a photonic quantum simulator
We demonstrate an entanglement mapping based characterisation protocol for coupled-qubit Hamiltonians. This is achieved by generating and measuring time-evolved states relevant to an NV-diamond
On-chip generation and analysis of maximal path-frequency entanglement
We present a silicon-on-insulator quantum photonic device able to generate and analyze two maximally entangled qubits. Quantum interference between resonant four-wave mixing sources, phase-stable
Quantum entanglement on photonic chips: a review
Abstract. Entanglement is one of the most vital properties of quantum mechanical systems, and it forms the backbone of quantum information technologies. Taking advantage of nano/microfabrication and
Silicon quantum photonic circuits for on-chip qubit generation, manipulation and logic operations
A silicon photonic quantum waveguide circuit capable of generating and manipulating quantum states on-chip is demonstrated. Path-separated indistinguishable photon states are generated and
Entanglement distribution between integrated silicon photonic chips
We demonstrate high-fidelity distribution of entanglement across two integrated silicon photonic chips, by observing a violation of a Bell-type inequality of 2.638±0.039. Entanglement states are
Optically tunable entangled photon state generation in a nonlinear directional coupler
We propose and experimentally demonstrate an all-optically tunable biphoton quantum light source using a nonlinear directional coupler. The source can generate high-fidelity N00N states, completely
Continuous-variable entanglement on a chip
The capabilities of continuous variable (CV) quantum technology — homodyne detection and characterization of Einstein–Podolsky–Rosen entangled light — are demonstrated by sending CV light at 860 nm
Generation of reconfigurable photon-pair states in aperiodically poled quadratic waveguide arrays
We propose special poling of quadratic nonlinear waveguide arrays enabling generation of photon pairs in any path entangled quantum state. Real-time switching between output quantum states can be
On-chip quantum interference between silicon photon-pair sources
A silicon-on-insulator device combining two four-wave-mixing photon-pair sources in an interferometer with a reconfigurable phase shifter is used to create and manipulate non-degenerate or
Chip-to-chip quantum entanglement distribution
We present the first experimental demonstration of quantum entanglement distribution between silicon integrated photonic chips, linked by a single mode optical fiber. Entanglement states generation,