Tomography via correlation of noisy measurement records

Colm A. Ryan, Blake R. Johnson, Jay M. Gambetta, Jerry M. Chow, Marcus P. da Silva, Oliver E. Dial, and Thomas A. Ohki
Phys. Rev. A 91, 022118 – Published 20 February 2015

Abstract

We present methods and results for tomographic measurement of quantum systems through shot-by-shot correlation of individual qubit measurements. Rather than inferring the qubit state after each measurement, we show that averaging of continuous soft values is a valid tomographic strategy and is in fact the better choice in the regime of low signal-to-noise ratio. We experimentally demonstrate a matched filter approach to account for a transient measurement response, and use this to show that tomography of entangled states is feasible despite the asymptotic exponential effort required to obtain N-body corrleations.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 20 December 2013
  • Revised 18 December 2014

DOI:https://doi.org/10.1103/PhysRevA.91.022118

©2015 American Physical Society

Authors & Affiliations

Colm A. Ryan1, Blake R. Johnson1, Jay M. Gambetta2, Jerry M. Chow2, Marcus P. da Silva1, Oliver E. Dial2, and Thomas A. Ohki1

  • 1Raytheon BBN Technologies, Cambridge, Massachusetts 02138, USA
  • 2IBM T.J. Watson Research Center, Yorktown Heights, New York 10598, USA

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 91, Iss. 2 — February 2015

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review A

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×