Dresden 2006 – scientific programme
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TT: Tiefe Temperaturen
TT 26: Transport - Poster Session
TT 26.16: Poster
Wednesday, March 29, 2006, 14:30–18:30, P1
Information transfer in permanently coupled spin chains — •Daniel Burgarth1, Sougato Bose1, and Vittorio Giovannetti2 — 1Department of Physics & Astronomy, University College London, Gower St., London WC1E 6BT, UK — 2NEST-INFM & Scuola Normale Superiore, piazza dei Cavalieri 7, I-56126 Pisa, Italy
The transfer of quantum information is a crucial part of any quantum computation. Recently it was suggested to use permanently coupled systems for transferring quantum states. This is especially important in solid state implementations (such as flux qubits) where dynamical control of the couplings is difficult to implement. However, in many cases using permanent couplings leads to dispersion and low fidelity. A proper choice of the coupling strengths overcomes this problem, but may be too difficult to engineer. We suggest a scheme that allows arbitrarily perfect state transfer even in the presence of random fluctuations in the couplings of a quantum chain. Hence our scheme puts minimal demand not only on the control of the chains when using them, but also on the design when building them. No control is required along the transmission line, but the sender and receiver have to be able to perform quantum gates and measurements.