Work

Implementing generalized measurements with superconducting qubits

Year: 2014

Type: article

Abstract: We describe a method to perform any generalized purity-preserving measurement of a qubit with techniques tailored to superconducting systems. First, we consider two methods for realizing a two-outcome partial projection: using a thresholded continuous measurement in the circuit QED setup and using an indirect ancilla qubit measurement. Second, we decompose an arbitrary purity-preserving two-outcome measurement into single-qubit unitary rotations and a partial projection. Third, we systematically reduce any multiple-outcome measurement to a sequence of such two-outcome measurements and unitary operations. Finally, we consider how to define suitable fidelity measures for multiple-outcome generalized measurements.

Source: Physical Review A

DOI: 10.1103/physreva.90.032302

Authors: Justin Dressel, Todd A. Brun, Alexander N. Korotkov

Institutions: University of California, Riverside, University of Southern California

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funder: Army Research Office

Awards: G1268575829, G4549770334