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

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

Research output: Contribution to journalArticle (Academic Journal)peer-review

70 Citations (Scopus)


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
Pages (from-to)-
Number of pages5
JournalPhysical Review Letters
Issue number16
Publication statusPublished - 14 Oct 2011

Structured keywords

  • QETLabs


Dive into the research topics of 'Heralding two-photon and four-photon path entanglement on a chip'. Together they form a unique fingerprint.

    O'Brien, J. L.


    Project: Research

Cite this