Manipulation of multiphoton entanglement in waveguide quantum circuits

J.C.F Matthews, A Politi, A.B Stefanov, J.L O'Brien

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

285 Citations (Scopus)

Abstract

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 multiphoton 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 two- and four-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.
Translated title of the contributionManipulation of multiphoton entanglement in waveguide quantum circuits
Original languageEnglish
Pages (from-to)346 - 350
Number of pages5
JournalNature Photonics
Volume3
Issue number6
DOIs
Publication statusPublished - Jun 2009

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