Physics – Quantum Physics
Scientific paper
2008-11-25
Phys. Rev. A, 79, 042325, (2009)
Physics
Quantum Physics
Published version, containing additional discussion on the role of non-classicality in the locking of classical correlations
Scientific paper
We investigate signatures of non-classicality in quantum states, in particular, those involved in the DQC1 model of mixed-state quantum computation [Phys. Rev. Lett. 81, 5672 (1998)]. To do so, we consider two known non-classicality criteria. The first quantifies disturbance of a quantum state under locally noneffective unitary operations (LNU), which are local unitaries acting invariantly on a subsystem. The second quantifies measurement induced disturbance (MID) in the eigenbasis of the reduced density matrices. We study the role of both figures of non-classicality in the exponential speedup of the DQC1 model and compare them vis-a-vis the interpretation provided in terms of quantum discord. In particular, we prove that a non-zero quantum discord implies a non-zero shift under LNUs. We also use the MID measure to study the locking of classical correlations [Phys. Rev. Lett. 92, 067902 (2004)] using two mutually unbiased bases (MUB). We find the MID measure to exactly correspond to the number of locked bits of correlation. For three or more MUBs, it predicts the possibility of superior locking effects.
Datta Animesh
Gharibian Sevag
No associations
LandOfFree
Signatures of non-classicality in mixed-state quantum computation 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 Signatures of non-classicality in mixed-state quantum computation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signatures of non-classicality in mixed-state quantum computation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-303807