Experimental realization of nonunitary multi-qubit operations

Abstract

We demonstrate a novel experimental toolset that enables irreversible multi-qubit operations on a quantum platform. To exemplify our approach, we realize two elementary nonunitary operations: the OR and NOR gates. The electronic states of two trapped ${}^{40}$Ca${}^{+}$ ions encode the logical information, and a co-trapped ${}^{88}$Sr${}^{+}$ ion provides the irreversibility of the gate by a dissipation channel through sideband cooling. We measure $87\%$ and $81\%$ success rates for the OR and NOR gates, respectively. The presented methods are a stepping stone towards other nonunitary operations such as in quantum error correction and quantum machine learning.

arXiv comment5 main text pages, 2 supplemental material pages, 4 main text figures, 1 supplemental material figure, 1 supplemental material table

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