Manipulating multi-photon entanglement in waveguide quantum circuits

Details Manipulating multi-photon entanglement in waveguide quantum circuits Manipulating multi-photon entanglement in waveguide quantum circuits

2009-11-06

arxiv.org/abs/0911.1257v1

Nature Photonics, 3, 346-350 (2009)

Physics

Quantum Physics

8 pages, 9 figures

Scientific paper

10.1038/nphoton.2009.93

On-chip integrated photonic circuits are crucial to further progress towards quantum technologies and in the science of quantum optics. Here we report precise control of single photon states and multi-photon entanglement directly on-chip. We manipulate the state of path-encoded qubits using integrated optical phase control based on resistive elements, observing an interference contrast of 98.2+/-0.3%. We demonstrate integrated quantum metrology by observing interference fringes with 2- and 4-photon entangled states generated in a waveguide circuit, with respective interference contrasts of 97.2+/-0.4% and 92+/-4%, sufficient to beat the standard quantum limit. Finally, we demonstrate a reconfigurable circuit that continuously and accurately tunes the degree of quantum interference, yielding a maximum visibility of 98.2+/- 0.9%. These results open up adaptive and fully reconfigurable photonic quantum circuits not just for single photons, but for all quantum states of light.

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