MRS Meetings and Events

 

EL12.04.04 2023 MRS Spring Meeting

Quantum Control and Coherence of Spins from Semiconductor Devices to Synthetic Qubits

When and Where

Apr 12, 2023
9:30am - 10:00am

Moscone West, Level 3, Room 3003

Presenter

Co-Author(s)

David Awschalom1,Pratiti Deb1,Sam Bayliss1,2,Leah Weiss1,Nikita Onizhuk1,Daniel Laorenza3,Giulia Galli1,Danna Freedman3

University of Chicago1,University of Glasgow2,Massachusetts Institute of Technology3

Abstract

David Awschalom1,Pratiti Deb1,Sam Bayliss1,2,Leah Weiss1,Nikita Onizhuk1,Daniel Laorenza3,Giulia Galli1,Danna Freedman3

University of Chicago1,University of Glasgow2,Massachusetts Institute of Technology3
Quantum technologies benefit from atom-scale control of both the quantum bit and its local environment. In semiconductor materials, defects and dopants house localized electrons where the spin degree of freedom can be initialized and coherently controlled with a combination of optical and microwave signals. These semiconductor spin-qubits can be embedded in devices where their optical and spin properties can be enhanced by controlling both their electronic and nuclear-spin environment. Organometallic molecules provide an analogous platform for localized, coherent quantum states where both the qubit and its environment can be further modified via chemical synthesis. We have demonstrated optical addressability and coherent microwave control of the electron-spin ground-state of organometallic molecules containing a central chromium ion [1]. We have shown that the spin-optical interface of these molecular qubits can be tuned by modifying the structure and symmetry of the ligand field [1,2]. Atomistic modification of not only the qubit itself, but also its host environment can further be used to protect the qubit from magnetic field noise, for example due to the fluctuating electron or nuclear spin bath, yielding a five-fold improvement in spin coherence times by inducing noise-insensitive clock transitions [3]. This scalable approach to engineering quantum systems from the bottom up opens new avenues for tailoring synthetic qubits toward device-scale integration.<br/> <br/>[1] S.L. Bayliss*, D.W. Laorenza* <i>et al,</i> Science <b>370</b>, 1309 (2020)<br/>[2] D. W. Laorenza <i>et al,</i> JACS <b>143</b>, 50 (2021)<br/>[3] S.L. Bayliss*, P. Deb*, D.W. Laorenza* <i>et al,</i> PRX <b>12</b>, 031028 (2022)

Symposium Organizers

Luis Campos, Columbia University
Pascal Gehring, University Catholic Louvain
Maiken Mikkelsen, Duke University
Farnaz Niroui, Massachusetts Institute of Technology

Symposium Support

Bronze
Raith America, Inc.
Royal Society of Chemistry

Publishing Alliance

MRS publishes with Springer Nature