Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

State Readout of a Trapped Ion Qubit Using a Trap-integrated Superconducting Photon Detector

Published

Author(s)

Susanna L. Todaro, Varun Verma, Katherine C. McCormick, David T. Allcock, Richard Mirin, David J. Wineland, Sae Woo Nam, Andrew Wilson, Dietrich Leibfried, Daniel Slichter

Abstract

We detect fluorescence photons emitted by a single $^9$Be$^+$ ion confined in a surface- electrode rf ion trap, using a superconducting nanowire single photon detector integrated directly into the trap. We achieve a qubit readout fidelity of 99.91(1) % with an average readout duration of 46 $\mu$s, limited by the polarization impurity of the readout laser beam and off-resonant optical pumping into the fluorescing state. We use the ion fluorescence to perform an absolute calibration of the detector quantum efficiency and characterize its dependence on incidence angle and polarization.
Citation
Physical Review Letters

Keywords

Superconducting photon detector, single photon detector, ion trap, quantum measurement, quantum computing

Citation

Todaro, S. , Verma, V. , McCormick, K. , Allcock, D. , Mirin, R. , Wineland, D. , , S. , Wilson, A. , Leibfried, D. and Slichter, D. (2021), State Readout of a Trapped Ion Qubit Using a Trap-integrated Superconducting Photon Detector, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929700 (Accessed June 24, 2021)
Created January 6, 2021, Updated April 23, 2021