Spin based heat engine: demonstration of multiple rounds of algorithmic cooling

Phys Rev Lett. 2008 Apr 11;100(14):140501. doi: 10.1103/PhysRevLett.100.140501. Epub 2008 Apr 9.

Abstract

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.

Publication types

  • Research Support, Non-U.S. Gov't