Download Quantum state transfer through spin

Short-distance quantum state transfer through spin chains
Nguyen Ba An
Institute of Physics
Abstract
Transferring quantum information encoded in quantum states of spins from one system to
another is necessary in quantum information processing and quantum distributed
computing. When the systems are far apart, photons can serve as the most suitable
carriers of quantum information. This, however, has difficulties in the interfacing
problem, i.e., the problem of mapping quantum information of spins to photons and vice
versa. When the systems are close to each other, quantum state transfer can be done
through spin chains that directly connect the systems, without resorting to photons. Here
we present several methods for quantum state transfer through spin chains, exploiting (i)
a sequence of in-time swapping gates, (ii) natural evolution and (iii) appropriately
designed measurement-based strategies.
References
1. Z. X. Man, N. B. An, Y. J. Xia and J. Kim, Phys. Lett. A 378, 2063 (2014): “Controllable
entanglement transfer via two parallel spin chains”
2. Z. X. Man, N. B. An and Y. J. Xia, Ann. Phys. 349, 209 (2014): “Improved quantum state
transfer via quantum partially collapsing measurements”
3. Z. X. Man, N. B. An, Y. J. Xia and J. Kim, Ann. Phys. 351, 739 (2014): “Universal scheme for
finite-probability perfect transfer of arbitrary multispin states through spin chains”