Qubit metrology and decoherence

Details Qubit metrology and decoherence Qubit metrology and decoherence

2007-05-07

arxiv.org/abs/0705.1002v1

Physics

Quantum Physics

24 Pages, 3 Figures

Scientific paper

10.1103/PhysRevA.76.032111

Quantum properties of the probes used to estimate a classical parameter can be used to attain accuracies that beat the standard quantum limit. When qubits are used to construct a quantum probe, it is known that initializing $n$ qubits in an entangled "cat state," rather than in a separable state, can improve the measurement uncertainty by a factor of $1/\sqrt{n}$. We investigate how the measurement uncertainty is affected when the individual qubits in a probe are subjected to decoherence. In the face of such decoherence, we regard the rate $R$ at which qubits can be generated and the total duration $\tau$ of a measurement as fixed resources, and we determine the optimal use of entanglement among the qubits and the resulting optimal measurement uncertainty as functions of $R$ and $\tau$.

Affiliated with

Also associated with

No associations

Rating

Qubit metrology and decoherence 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 Qubit metrology and decoherence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Qubit metrology and decoherence will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-152849