Universal observable detecting all two-qubit entanglement and determinant based separability tests

Details Universal observable detecting all two-qubit entanglement and determinant based separability tests Universal observable detecting all two-qubit entanglement and determinant based separability tests

2006-04-14

arxiv.org/abs/quant-ph/0604109v2

Physical Review A 77, 030301(R) (2008)

Physics

Quantum Physics

5 pages, RevTeX, one figure replaced by another, tight bounds on negativity and concurrence added, function proved to be a mon

Scientific paper

We construct a single observable measurement of which mean value on four copies of an {\it unknown} two-qubit state is sufficient for unambiguous decision whether the state is separable or entangled. In other words, there exists a universal collective entanglement witness detecting all two-qubit entanglement. The test is directly linked to a function which characterizes to some extent the entanglement quantitatively. This function is an entanglement monotone under so--called local pure operations and classical communication (pLOCC) which preserve local dimensions. Moreover it provides tight upper and lower bounds for negativity and concurrence. Elementary quantum computing device estimating unknown two-qubit entanglement is designed.

Affiliated with

Also associated with

No associations

Rating

Universal observable detecting all two-qubit entanglement and determinant based separability tests 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 Universal observable detecting all two-qubit entanglement and determinant based separability tests, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Universal observable detecting all two-qubit entanglement and determinant based separability tests will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-326804