Quantum-enhanced interferometry with large heralded photon-number states
Abstract
Quantum phenomena such as entanglement can improve fundamental limits on the sensitivity of a measurement probe. In optical interferometry, a probe consisting of N entangled photons provides up to a √{N }? enhancement in phase sensitivity compared to a classical probe of the same energy. Here, we employ high-gain parametric down-conversion sources and photon-number-resolving detectors to perform interferometry with heralded quantum probes of sizes up to N = 8 (i.e. measuring up to 16-photon coincidences). Our probes are created by injecting heralded photon-number states into an interferometer, and in principle provide quantum-enhanced phase sensitivity even in the presence of significant optical loss. Our work paves the way toward quantum-enhanced interferometry using large entangled photonic states.
- Publication:
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npj Quantum Information
- Pub Date:
- October 2020
- DOI:
- 10.1038/s41534-020-00320-y
- arXiv:
- arXiv:2006.08449
- Bibcode:
- 2020npjQI...6...89T
- Keywords:
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- Quantum Physics
- E-Print:
- 15 pages, 9 figures