Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

NMR Spectroscopy: Spin–Spin Coupling

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...

Spin–Spin Coupling Constant: Overview

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

Coulomb's Law and The Principle of Superposition

Coulomb's Law and The Principle of Superposition

Coulomb's Law describes the force experienced by two point charges under each other's presence. But what if there are more than two charges? For example, if there is a third charge, does it experience a force that is a simple combination of the individual forces due to the first two charges? Can it be described mathematically?
The Principle of Superposition answers the question. Yes, Coulomb's Law applies to each pair of charges, and the net force on each charge is the vector sum of the...

Spin–Spin Coupling: One-Bond Coupling

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...

Superconductor

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Nonreciprocal Microwave Signal Processing with a Field-Programmable Josephson Amplifier.

Physical review applied·2024

Same author

Low-noise cryogenic microwave amplifier characterization with a calibrated noise source.

The Review of scientific instruments·2024

Same author

Control and readout of a superconducting qubit using a photonic link.

Nature·2021

Same author

Efficient Qubit Measurement with a Nonreciprocal Microwave Amplifier.

Physical review letters·2021

Same author

Ultrastrong Parametric Coupling between a Superconducting Cavity and a Mechanical Resonator.

Physical review letters·2020

Same author

Damping of Josephson Oscillations in Strongly Correlated One-Dimensional Atomic Gases.

Physical review letters·2018

Search research articles

Related Experiment Video

Updated: Jul 4, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Strong tunable coupling between a superconducting charge and phase qubit.

A Fay¹, E Hoskinson, F Lecocq

¹Institut Néel, C.N.R.S.-Université Joseph Fourier, BP 166, 38042 Grenoble-cedex 9, France.

Physical Review Letters

|June 4, 2008

Summary

This summary is machine-generated.

We achieved tunable coupling between a Cooper pair transistor (charge qubit) and a DC SQUID (phase qubit), enabling independent control and entanglement. This allows for precise quantum state manipulation and measurement via adiabatic quantum transfer.

More Related Videos

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Related Experiment Videos

Last Updated: Jul 4, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Area of Science:

Quantum computing
Solid-state physics
Superconductivity

Background:

Quantum bits (qubits) are fundamental to quantum computation.
Controlling and entangling qubits is crucial for building quantum processors.
Superconducting circuits offer a promising platform for qubit implementation.

Purpose of the Study:

To realize and investigate tunable coupling between a charge qubit and a phase qubit.
To demonstrate independent manipulation and entanglement of these two distinct superconducting qubits.
To validate the coupling mechanism with theoretical predictions.

Main Methods:

Fabrication of a circuit integrating an asymmetric Cooper pair transistor (charge qubit) and a DC SQUID (phase qubit).
Implementation of independent control protocols for each qubit's quantum state.
Utilizing adiabatic quantum transfer for charge qubit state measurement via the phase qubit.
Characterization of the tunable coupling strength, including capacitive and Josephson components.

Main Results:

Achieved tunable coupling between the charge and phase qubits over a broad frequency range.
Demonstrated independent manipulation of individual qubit states.
Successfully entangled the two qubits.
Measured coupling strength agrees with analytical theory incorporating both capacitive and tunable Josephson couplings.

Conclusions:

The developed circuit architecture allows for flexible and tunable coupling between different types of superconducting qubits.
Independent control and entanglement capabilities are essential for scalable quantum computing architectures.
The theoretical model accurately describes the observed coupling phenomena, providing a foundation for future circuit design.