Experimental demonstration of error-insensitive approximate universal-NOT gates

Sang Min Lee, Jeongho Bang, Heonoh Kim, Hyunseok Jeong, Jinhyoung Lee, Han Seb Moon

Published 2014-03-17Version 1

We propose and experimentally demonstrate an approximate universal-NOT (U-NOT) operation that is robust against operational errors. In our proposal, the U-NOT operation is composed of stochastic unitary operations represented by the vertices of regular polyhedrons. The operation is designed to be robust against random operational errors by increasing the number of unitary operations (i.e., reference axes). Remarkably, no increase in the total number of measurements nor additional resources are required to perform the U-NOT operation. Our method can be applied in general to reduce operational errors to an arbitrary degree of precision when approximating any anti-unitary operation in a stochastic manner.