Scalable Quantum Logic Spectroscopy

Published

November 2, 2022

Author(s)

Kaifeng Cui, Jose Valencia, Kevin Boyce, Ethan Clements, David Leibrandt, David Hume

Abstract

In quantum logic spectroscopy (QLS), one species of trapped ion is used as a sensor to detect the state of an otherwise inaccessible ion species. This extends precision measurements to a broader class of atomic and molecular systems for applications like atomic clocks and tests of fundamental physics. Here, we develop a new technique based on a Schrödinger cat interferometer to address the problem of scaling QLS to larger ion numbers. We demonstrate the basic features of this method using various combinations of 25-Mg+ logic ions and 27-Al+ spectroscopy ions. We observe higher detection efficiency by increasing the number of 25-Mg+ ions. Applied to multiple 27-Al+, this method will improve the stability of high-accuracy optical clocks and could enable Heisenberg-limited QLS.

Citation

Physical Review Letters

Volume

129

Issue

19

Pub Type

Journals

Download Paper

https://doi.org/10.1103/PhysRevLett.129.193603

Local Download

Keywords

quantum information, optical clocks, trapped ions, quantum metrology

Citation

Cui, K. , Valencia, J. , Boyce, K. , Clements, E. , Leibrandt, D. and Hume, D. (2022), Scalable Quantum Logic Spectroscopy, Physical Review Letters, [online], https://doi.org/10.1103/PhysRevLett.129.193603, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=933402 (Accessed October 9, 2025)