Physics – Quantum Physics
Scientific paper
2005-09-29
Quantum Information & Computation, Vol. 7 (No. 8), 782-798 (2007)
Physics
Quantum Physics
17 pages, 16 figures
Scientific paper
Unambiguous unitary maps and unambiguous unitary quantum channels are introduced and some of their properties are derived. These properties ensure certain simple form for the measurements involved in realizing an unambiguous unitary quantum channel. Error correction and unambiguous error correction with nonzero probability are discussed in terms of unambiguous unitary quantum channels. We not only re-derive the well-known condition for a set of errors to be correctable with certainty, but also obtain a necessary and sufficient condition for the errors caused by a noisy channel to be correctable with any nonzero probability. Dense coding with a partially entangled state can also be viewed as an unambiguous unitary quantum channel when all messages are required to be transmitted with equal probability of success, the maximal achievable probability of success is derived and the optimum protocol is also obtained.
Chen Xuemei
Wu Shengjun
No associations
LandOfFree
Unambiguous unitary quantum channels 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 Unambiguous unitary quantum channels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unambiguous unitary quantum channels will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-683526