An exact effective two-qubit gate in a chain of three spins

Details An exact effective two-qubit gate in a chain of three spins An exact effective two-qubit gate in a chain of three spins

2003-12-11

arxiv.org/abs/quant-ph/0312105v1

Quantum Information and Computation 4, 174 (2004)

Physics

Quantum Physics

RevTeX4, 7 pages, 4 figues

Scientific paper

We show that an effective two-qubit gate can be obtained from the free evolution of three spins in a chain with nearest neighbor XY coupling, without local manipulations. This gate acts on the two remote spins and leaves the mediating spin unchanged. It can be used to perfectly transfer an arbitrary quantum state from the first spin to the last spin or to simultaneously communicate one classical bit in each direction. One ebit can be generated in half of the time for state transfer. For longer spin chains, we present methods to create or transfer entanglement between the two end spins in half of the time required for quantum state transfer, given tunable coupling strength and local magnetic field. We also examine imperfect state transfer through a homogeneous XY chain.

Affiliated with

Also associated with

No associations

Rating

An exact effective two-qubit gate in a chain of three spins 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 An exact effective two-qubit gate in a chain of three spins, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An exact effective two-qubit gate in a chain of three spins will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-726465