Physics – Quantum Physics
Scientific paper
2006-12-11
Phys. Rev. A 75 (2007) 053805
Physics
Quantum Physics
Additional references included
Scientific paper
10.1103/PhysRevA.75.053805
The presence of loss limits the precision of an approach to phase measurement using maximally entangled states, also referred to as NOON states. A calculation using a simple beam-splitter model of loss shows that, for all nonzero values L of the loss, phase measurement precision degrades with increasing number N of entangled photons for N sufficiently large. For L above a critical value of approximately 0.785, phase measurement precision degrades with increasing N for all values of N. For L near zero, phase measurement precision improves with increasing N down to a limiting precision of approximately 1.018 L radians, attained at N approximately equal to 2.218/L, and degrades as N increases beyond this value. Phase measurement precision with multiple measurements and a fixed total number of photons N_T is also examined. For L above a critical value of approximately 0.586, the ratio of phase measurement precision attainable with NOON states to that attainable by conventional methods using unentangled coherent states degrades with increasing N, the number of entangled photons employed in a single measurement, for all values of N. For L near zero this ratio is optimized by using approximately N=1.279/L entangled photons in each measurement, yielding a precision of approximately 1.340 sqrt(L/N_T) radians.
Kaushik Sumanth
Rubin Mark A.
No associations
LandOfFree
Loss-Induced Limits to Phase Measurement Precision with Maximally Entangled States 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 Loss-Induced Limits to Phase Measurement Precision with Maximally Entangled States, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Loss-Induced Limits to Phase Measurement Precision with Maximally Entangled States will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-118273