Paramagnetic Materials and Practical Algorithmic Cooling for NMR Quantum Computing

Details Paramagnetic Materials and Practical Algorithmic Cooling for NMR Quantum Computing Paramagnetic Materials and Practical Algorithmic Cooling for NMR Quantum Computing

2005-11-16

arxiv.org/abs/quant-ph/0511153v1

International Journal of Quantum Information, Vol. 3, pp. 281-285 (2005)

Physics

Quantum Physics

5 pages, A conference version of this paper appeared in SPIE, volume 5105, pages 185-194 (2003)

Scientific paper

10.1117/12.485841

Algorithmic Cooling is a method that uses novel data compression techniques and simplecquantum computing devices to improve NMR spectroscopy, and to offer scalable NMR quantum computers. The algorithm recursively employs two steps. A reversible entropy compression of the computation quantum-bits (qubits) of the system and an irreversible heat transfer from the system to the environment through a set of reset qubits that reach thermal relaxation rapidly. Is it possible to experimentally demonstrate algorithmic cooling using existing technology? To allow experimental algorithmic cooling, the thermalization time of the reset qubits must be much shorter than the thermalization time of the computation qubits. However such thermalization-times ratios have yet to be reported. We investigate here the effect of a paramagnetic salt on the thermalization-times ratio of computation qubits (carbons) and a reset qubit (hydrogen). We show that the thermalization-times ratio is improved by approximately three-fold. Based on this result, an experimental demonstration of algorithmic cooling by thermalization and magnetic ions is currently performed by our group and collaborators.

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