Quantum coherence in the presence of unobservable quantities

Details Quantum coherence in the presence of unobservable quantities Quantum coherence in the presence of unobservable quantities

2003-06-12

arxiv.org/abs/quant-ph/0306084v1

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.68.042326

State representations summarize our knowledge about a system. When unobservable quantities are introduced the state representation is typically no longer unique. However, this non-uniqueness does not affect subsequent inferences based on any observable data. We demonstrate that the inference-free subspace may be extracted whenever the quantity's unobservability is guaranteed by a global conservation law. This result can generalize even without such a guarantee. In particular, we examine the coherent-state representation of a laser where the absolute phase of the electromagnetic field is believed to be unobservable. We show that experimental coherent states may be separated from the inference-free subspaces induced by this unobservable phase. These physical states may then be approximated by coherent states in a relative-phase Hilbert space.

Affiliated with

Also associated with

No associations

Rating

Quantum coherence in the presence of unobservable quantities 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 coherence in the presence of unobservable quantities, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum coherence in the presence of unobservable quantities will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-408500