Quantum-enhanced interferometry with large heralded photon-number states
- URL: http://arxiv.org/abs/2006.08449v2
- Date: Tue, 13 Oct 2020 18:57:46 GMT
- Title: Quantum-enhanced interferometry with large heralded photon-number states
- Authors: G.S. Thekkadath, M.E. Mycroft, B.A. Bell, C.G. Wade, A. Eckstein, D.S.
Phillips, R.B. Patel, A. Buraczewski, A.E. Lita, T. Gerrits, S.W. Nam, M.
Stobi\'nska, A.I. Lvovsky, I.A. Walmsley
- Abstract summary: In optical interferometry, a probe consisting of $N$ entangled photons provides up to a $sqrtN$ enhancement in phase sensitivity.
Our work paves the way towards quantum-enhanced interferometry using large entangled photonic states.
- Score: 0.6533991589591085
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- 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 $\sqrt{N}$ 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 towards quantum-enhanced
interferometry using large entangled photonic states.
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