Experimental demonstration of phase measurement precision beating standard quantum limit by projection measurement

Details Experimental demonstration of phase measurement precision beating standard quantum limit by projection measurement Experimental demonstration of phase measurement precision beating standard quantum limit by projection measurement

2007-10-15

arxiv.org/abs/0710.2922v1

EPL, 82 (2008) 24001

Physics

Quantum Physics

5 figures

Scientific paper

10.1209/0295-5075/82/24001

We propose and demonstrate experimentally a projection scheme to measure the quantum phase with a precision beating the standard quantum limit. The initial input state is a twin Fock state $|N,N>$ proposed by Holland and Burnett [Phys. Rev. Lett. {\bf 71}, 1355 (1993)] but the phase information is extracted by a quantum state projection measurement. The phase precision is about $1.4/N$ for large photon number $N$, which approaches the Heisenberg limit of 1/N. Experimentally, we employ a four-photon state from type-II parametric down-conversion and achieve a phase uncertainty of $0.291\pm 0.001$ beating the standard quantum limit of $1/\sqrt{N} = 1/2$ for four photons.

Affiliated with

Also associated with

No associations

Rating

Experimental demonstration of phase measurement precision beating standard quantum limit by projection measurement 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 Experimental demonstration of phase measurement precision beating standard quantum limit by projection measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Experimental demonstration of phase measurement precision beating standard quantum limit by projection measurement will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-713733