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Related Concept Videos

Position and Displacement01:31

Position and Displacement

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The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
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Displacement Current01:19

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To describe the motion of an object, one should first be able to describe its position (where it is at any particular time). More precisely, the position needs to be specified relative to a convenient frame of reference. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference to describe the position of an object in relation to stationary objects on Earth.
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Significance of Displacement Current01:27

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A displacement current is analogous to a real current in Ampère's law, participating in Ampère's law the same way as the usual conduction current. However, it is produced by a changing electric field. Displacement current is defined in terms of a time-varying electric field, and also has an associated displacement current density. By adding a term accounting for displacement current, Maxwell modified the existing Ampère's law, which is now called generalized Ampère's law.
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Angular Velocity and Displacement01:08

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Uniform circular motion is motion in a circle at a constant speed. Although this is the simplest case of rotational motion, it is very useful for many situations and is used to introduce rotational variables. When a particle is moving in a circle, the coordinate system is fixed and serves as a frame of reference to define the particle’s position. Its position vector from the origin of the circle to the particle sweeps out the angle θ, which increases in the counterclockwise direction...
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Fabrication and Characterization of Superconducting Resonators
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Gated Conditional Displacement Readout of Superconducting Qubits.

S Touzard1, A Kou1, N E Frattini1

  • 1Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA.

Physical Review Letters
|April 2, 2019
PubMed
Summary

We developed a new method to read out superconducting qubits by observing a conditioned coherent state displacement in a readout cavity. This allows for faster qubit measurements with minimal dephasing, advancing quantum computing and error correction.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Information Science

Background:

  • Superconducting qubits are a leading platform for quantum computation.
  • Efficient and high-fidelity readout of qubit states is crucial for scalable quantum processors.
  • Current readout methods can suffer from crosstalk and dephasing, limiting performance.

Purpose of the Study:

  • To introduce a novel interaction between superconducting qubits and a readout cavity.
  • To demonstrate state-conditional coherent state displacement for qubit readout.
  • To enable high-fidelity, low-dephasing measurement of individual qubits in a multi-qubit system.

Main Methods:

  • Engineered a specific interaction coupling superconducting qubits to a readout resonator.
  • Utilized a phase-sensitive amplifier to measure the in-phase quadrature of the cavity state.
  • Implemented a multi-qubit architecture sharing a single readout resonator.

Main Results:

  • Achieved state-conditional displacement of a coherent state in the readout cavity.
  • Demonstrated measurement of a target qubit's state with minimal dephasing of other coupled qubits.
  • The measured observable directly corresponds to the qubit's state via the in-phase quadrature.

Conclusions:

  • The novel qubit-cavity interaction facilitates efficient and selective qubit readout.
  • This technique offers a promising pathway towards faster superconducting qubit measurements.
  • Potential applications include improved bosonic quantum error-correcting codes and scalable quantum computing architectures.