Heralding two-photon and four-photon path entanglement on a chip

Jonathan C F Matthews, Alberto Politi, Damien Bonneau, Jeremy L. O'Brien

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70 Citations (Scopus)
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Generating quantum entanglement is not only an important scientific endeavor, but will be essential to realizing quantum-enhanced technologies, in particular, quantum-enhanced measurements with precision beyond classical limits. We investigate the heralded generation of multiphoton entanglement for quantum metrology using a reconfigurable integrated waveguide device in which projective measurement of auxiliary photons heralds the generation of path-entangled states. We use four and six-photon inputs, to analyze the heralding process of two- and four-photon NOON states-a superposition of N photons in two paths, capable of enabling phase supersensitive measurements at the Heisenberg limit. Realistic devices will include imperfections; as part of the heralded state preparation, we demonstrate phase superresolution within our chip with a state that is more robust to photon loss.

Original languageEnglish
Article number163602
JournalPhysical Review Letters
Issue number16
Publication statusPublished - 11 Oct 2011
Externally publishedYes


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