Self-consistent Measurement and State Tomography of an Exchange-only Spin Qubit

Overview

Journal Nat Nanotechnol

Specialty Biotechnology

Date 2013 Sep 3

PMID 23995458

Citations 23

Authors

J Medford

J Beil

J M Taylor

S D Bartlett

A C Doherty

E I Rashba

D P DiVincenzo

H Lu

A C Gossard

C M Marcus

Affiliations

Soon will be listed here.

Abstract

Quantum-dot spin qubits characteristically use oscillating magnetic or electric fields, or quasi-static Zeeman field gradients, to realize full qubit control. For the case of three confined electrons, exchange interaction between two pairs allows qubit rotation around two axes, hence full control, using only electrostatic gates. Here, we report initialization, full control, and single-shot readout of a three-electron exchange-driven spin qubit. Control via the exchange interaction is fast, yielding a demonstrated 75 qubit rotations in less than 2 ns. Measurement and state tomography are performed using a maximum-likelihood estimator method, allowing decoherence, leakage out of the qubit state space, and measurement fidelity to be quantified. The methods developed here are generally applicable to systems with state leakage, noisy measurements and non-orthogonal control axes.

Citing Articles

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Universal logic with encoded spin qubits in silicon.

Weinstein A, Reed M, Jones A, Andrews R, Barnes D, Blumoff J Nature. 2023; 615(7954):817-822.

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Parametric longitudinal coupling between a high-impedance superconducting resonator and a semiconductor quantum dot singlet-triplet spin qubit.

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Semiconductor quantum computation.

Zhang X, Li H, Cao G, Xiao M, Guo G, Guo G Natl Sci Rev. 2021; 6(1):32-54.

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Approximate exchange-only entangling gates for the three-spin-1/2 decoherence-free subsystem.

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