Thermal effects on quantum communication through spin chains

Details Thermal effects on quantum communication through spin chains Thermal effects on quantum communication through spin chains

2004-12-15

arxiv.org/abs/quant-ph/0412115v2

Physical Rev. A, 71, 042330 (2005)

Physics

Quantum Physics

14 pages, Latex, five eps figures, references added

Scientific paper

10.1103/PhysRevA.71.042330

We study the effect of thermal fluctuations in a recently proposed protocol for transmission of unknown quantum states through quantum spin chains. We develop a low temperature expansion for general spin chains. We then apply this formalism to study exactly thermal effects on short spin chains of four spins. We show that optimal times for extraction of output states are almost independent of the temperature which lowers only the fidelity of the channel. Moreover we show that thermal effects are smaller in the anti-ferromagnetic chains than the ferromagnetic ones.

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