Physics – Quantum Physics
Scientific paper
2009-10-10
Phys. Rev. Lett. 105, 013603 (2010)
Physics
Quantum Physics
7 pages, 4 figures: Extended version (with appendices), updated in response to Referee comments
Scientific paper
10.1103/PhysRevLett.105.013603
We explore the advantages offered by twin light beams produced in parametric down-conversion for precision measurement. The symmetry of these bipartite quantum states, even under losses, suggests that monitoring correlations between the divergent beams permits a high-precision inference of any symmetry-breaking effect, e.g. fiber birefringence. We show that the quantity of entanglement is not the key feature for such an instrument. In a lossless setting, scaling of precision at the ultimate `Heisenberg' limit is possible with photon counting alone. Even as photon losses approach 100% the precision is shot-noise limited, and we identify the crossover point between quantum and classical precision as a function of detected flux. The predicted hypersensitivity is demonstrated with a Bayesian simulation.
Cable Hugo
Durkin Gabriel A.
No associations
LandOfFree
Quantum Phase Estimation with Entangled Photons produced by Parametric Down Conversion does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Quantum Phase Estimation with Entangled Photons produced by Parametric Down Conversion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum Phase Estimation with Entangled Photons produced by Parametric Down Conversion will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-98857