Report

Repetitive Readout of a Single Electronic Spin via Quantum Logic with Nuclear Spin Ancillae

Science  09 Oct 2009:
Vol. 326, Issue 5950, pp. 267-272
DOI: 10.1126/science.1176496

You are currently viewing the abstract.

View Full Text

Via your Institution

Log in through your institution

Log in through your institution


Abstract

Robust measurement of single quantum bits plays a key role in the realization of quantum computation and communication as well as in quantum metrology and sensing. We have implemented a method for the improved readout of single electronic spin qubits in solid-state systems. The method makes use of quantum logic operations on a system consisting of a single electronic spin and several proximal nuclear spin ancillae in order to repetitively readout the state of the electronic spin. Using coherent manipulation of a single nitrogen vacancy center in room-temperature diamond, full quantum control of an electronic-nuclear system consisting of up to three spins was achieved. We took advantage of a single nuclear-spin memory in order to obtain a 10-fold enhancement in the signal amplitude of the electronic spin readout. We also present a two-level, concatenated procedure to improve the readout by use of a pair of nuclear spin ancillae, an important step toward the realization of robust quantum information processors using electronic- and nuclear-spin qubits. Our technique can be used to improve the sensitivity and speed of spin-based nanoscale diamond magnetometers.

  • * These authors contributed equally to this work.

  • Present address: Institute for Quantum Information, California Institute of Technology, Pasadena, CA 91125, USA.

  • Present address: Joint Quantum Institute, University of Maryland, College Park, MD 20742, USA.

View Full Text