Quantum Communication Through an Unmodulated Spin Chain
Abstract
We propose a scheme for transmitting an unknown quantum state encoded in a spin to a distance by simply placing the spin at a suitable location in a spin chain. The spin chain is not subject to any modulation by external fields or any measurements during the transfer. The scheme is illustrated using an isotropic ferromagnetic Heisenberg ring and an explicit formula for the fidelity of quantum state transfer between remotest spins is obtained in terms of a discrete Fourior transform. We find that a four spin closed chain allows perfect (noiseless) quantum communication, even numbered chains perform better than odd numbered ones and show that even a chain of 84 spins allow better than classical state transfer.Keywords
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