Phys. Rev. Lett. 100, 140501 (2008) [4 pages]Spin Based Heat Engine: Demonstration of Multiple Rounds of Algorithmic CoolingReceived 19 June 2007; published 9 April 2008 We experimentally demonstrate multiple rounds of heat-bath algorithmic cooling in a 3 qubit solid-state nuclear magnetic resonance quantum information processor. By pumping entropy into a heat bath, we are able to surpass the closed system limit of the Shannon bound and purify a single qubit to 1.69 times the heat-bath polarization. The algorithm combines both high fidelity coherent control and a deliberate interaction with the environment. Given this level of quantum control in systems with larger reset polarizations, nearly pure qubits should be achievable. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.140501
DOI:
10.1103/PhysRevLett.100.140501
PACS:
03.67.Lx, 05.70.−a, 76.60.−k
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