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Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Related Experiment Video

Updated: May 8, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Two-qubit gates for resonant exchange qubits.

Andrew C Doherty¹, Matthew P Wardrop

¹Centre for Engineered Quantum Systems, School of Physics, The University of Sydney, Sydney NSW 2006, Australia. andrew.doherty@sydney.edu.au

Physical Review Letters

|August 20, 2013

Summary

Researchers demonstrate a simple, single-pulse controlled-phase gate for resonant exchange qubits. This breakthrough simplifies two-qubit operations in quantum dots by suppressing leakage, unlike previous methods.

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Area of Science:

Quantum Computing
Quantum Information Science
Solid-State Physics

Background:

Single-qubit operations using exchange interactions in gate-defined quantum dots have been achieved.
The resonant exchange qubit is a novel approach for implementing these operations.

Purpose of the Study:

To demonstrate the feasibility of performing two-qubit operations, specifically the controlled-phase gate, between resonant exchange qubits.
To contrast the efficiency of this new method with existing protocols for exchange qubits.

Main Methods:

Utilizing a single exchange pulse to perform a controlled-phase gate.
Operating within the resonant exchange qubit regime where energy conservation suppresses leakage.

Main Results:

A straightforward implementation of the controlled-phase gate between resonant exchange qubits was achieved.
This method requires only a single pulse, significantly reducing complexity compared to other protocols.
Energy conservation in the resonant mode effectively suppresses leakage errors during the two-qubit operation.

Conclusions:

The resonant exchange qubit architecture offers a simplified and robust pathway for implementing essential two-qubit gates.
This advancement has the potential to accelerate the development of scalable quantum processors based on exchange-coupled quantum dots.