Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.163602
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Funding
- EPSRC
- ERC
- IARPA
- Leverhulme Trust
- PHORPBITECH
- QAP
- Q-ESSENCE
- QIP
- IRC
- QUANTIP
- NSQI
- Royal Society
- Engineering and Physical Sciences Research Council [EP/F010524/1] Funding Source: researchfish
- EPSRC [EP/F010524/1] Funding Source: UKRI
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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.
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