Quantum state tomography by continuous measurement and compressed sensing

A. Smith, C. A. Riofrío, B. E. Anderson, H. Sosa-Martinez, I. H. Deutsch, P. S. Jessen

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

The need to perform quantum state tomography on ever-larger systems has spurred a search for methods that yield good estimates from incomplete data. We study the performance of compressed sensing (CS) and least squares (LS) estimators in a fast protocol based on continuous measurement on an ensemble of cesium atomic spins. They both efficiently reconstruct nearly pure states in the 16-dimensional ground manifold, reaching average fidelities F ̄CS=0.92 and F̄LS=0.88 using similar amounts of incomplete data. Surprisingly, the main advantage of CS in our protocol is an increased robustness to experimental imperfections.

Original languageEnglish (US)
Article number030102
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume87
Issue number3
DOIs
StatePublished - Mar 11 2013

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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