Experimental demonstration of selective quantum process tomography on an NMR quantum information processor

Akshay Gaikwad, Diksha Rehal, Amandeep Singh, Arvind, and Kavita Dorai
Phys. Rev. A 97, 022311 – Published 7 February 2018

Abstract

We present the NMR implementation of a scheme for selective and efficient quantum process tomography without ancilla. We generalize this scheme such that it can be implemented efficiently using only a set of measurements involving product operators. The method allows us to estimate any element of the quantum process matrix to a desired precision, provided a set of quantum states can be prepared efficiently. Our modified technique requires fewer experimental resources as compared to the standard implementation of selective and efficient quantum process tomography, as it exploits the special nature of NMR measurements to allow us to compute specific elements of the process matrix by a restrictive set of subsystem measurements. To demonstrate the efficacy of our scheme, we experimentally tomograph the processes corresponding to “no operation,” a controlled-NOT (CNOT), and a controlled-Hadamard gate on a two-qubit NMR quantum information processor, with high fidelities.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 2 August 2017

DOI:https://doi.org/10.1103/PhysRevA.97.022311

©2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Quantum Information, Science & Technology

Authors & Affiliations

Akshay Gaikwad*, Diksha Rehal, Amandeep Singh, Arvind§, and Kavita Dorai

  • Department of Physical Sciences, Indian Institute of Science Education & Research Mohali, Sector 81 SAS Nagar, Manauli PO 140306 Punjab, India

  • *akshayg@iisermohali.ac.in
  • diksharehal@ug.iisc.in
  • amandeepsingh@iisermohali.ac.in
  • §arvind@iisermohali.ac.in
  • kavita@iisermohali.ac.in

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 97, Iss. 2 — February 2018

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
×