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TT: Tiefe Temperaturen

TT 29: Transport: Quantum Coherence and Quantum Information Systems - Part 1

TT 29.6: Talk

Thursday, March 30, 2006, 11:00–11:15, HSZ 304

Full read and write access to sets of permanently coupled qubits by local control only — •Daniel Burgarth¹ and Vittorio Giovannetti² — ¹Department of Physics & Astronomy, University College London, UK — ²NEST-INFM & Scuola Normale Superiore, Pisa, Italy

We propose a protocol that transfers arbitrary quantum states from a quantum memory to a set of permanently coupled qubits and vice versa by controlling a local subset of qubits only. We give a sufficient condition for the convergence of the protocol and provide some numerical examples. In particular, we demonstrate that perfect state transfer and state preparation is possible on 1d Heisenberg spin chains with random coupling strengths.