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Related Concept Videos

Inductors01:11

Inductors

An inductor is a passive component built to store energy within its magnetic field. It can be fabricated by coiling a wire around a magnetic core. When current is permitted to flow through this inductor, it is observed that the voltage across the inductor is directly proportional to the time rate of change of the current. Mathematically,
Inductors01:20

Inductors

An inductor, also known as a choke, is a circuit component created to have a specific inductance. Inductors are among the crucial circuit components used in modern electronics, along with resistors and capacitors. They serve as a barrier against changes in a circuit's current. An inductor tends to suppress current changes in an alternating-current circuit that are faster than desired. In a direct-current circuit, an inductor aids in preserving a constant current despite changes in the applied...
Inductor in an AC Circuit01:16

Inductor in an AC Circuit

The basic components of an inductor are coils or loops of wire that are either wound around a hollow tube former or a ferromagnetic material (iron-cored) to increase their inductive value or inductance. When a voltage is applied across an inductor's terminals, a magnetic field is created, where the inductor stores its energy. The inductor's own self-induced or back emf value controls the growth of the current flowing through it.  This back emf voltage is proportional to the rate of variation of...
Energy Stored in Inductors01:16

Energy Stored in Inductors

An inductor is ingeniously crafted to accumulate energy within its magnetic field. This field is a direct result of the current that meanders through its coiled structure. When this current maintains a steady state, there is no detectable voltage across the inductor, prompting it to mimic the behavior of a short circuit when faced with direct current.
In terms of gauging the energy stored within an inductor, it is equivalent to the integral of the power delivered at every individual moment, all...
Self-Inductance01:24

Self-Inductance

Mutual inductance arises when a current in one circuit produces a changing magnetic field that induces an emf in another circuit. On the other hand, self-inductance arises when the current passing through the circuit changes, creating a changing magnetic flux, resulting in inductance in the same circuit.
Consider a circuit connected to an AC source. As the current varies with time, the magnetic flux through the circuit correspondingly changes. Faraday's law tells us that an emf would therefore...
Inductance: Solid Cylindrical Conductor01:24

Inductance: Solid Cylindrical Conductor

To calculate the inductance of a solid cylindrical conductor, consider a 1-meter section of a non-magnetic, current-carrying conductor with radius r. Disregarding end effects and assuming uniform current density, Ampere's law helps determine the magnetic field inside the conductor. This law states that the magnetic field intensity H is concentric and constant within the conductor.
Given the uniform current distribution, the magnetic field Hx and flux density Bx inside the conductor are...

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Published on: August 2, 2019

Quantum superinductor with tunable nonlinearity.

M T Bell1, I A Sadovskyy, L B Ioffe

  • 1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.

Physical Review Letters
|October 4, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a superinductor, a novel quantum device with high impedance. This dissipationless element, built from Josephson junctions, shows promise for advanced quantum computing and precise electrical standards.

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Area of Science:

  • Quantum electronics
  • Solid-state physics
  • Superconducting devices

Background:

  • Superconductors are crucial for quantum technologies.
  • Developing elements with high impedance and tunability is essential for advanced quantum circuits.
  • Existing quantum devices face challenges with noise and fault tolerance.

Purpose of the Study:

  • To realize a superinductor with significantly high microwave impedance exceeding the resistance quantum.
  • To design a tunable superinductor using nanoscale Josephson junctions.
  • To explore its potential applications in quantum computing and metrology.

Main Methods:

  • Fabrication of a superinductor using a ladder of nanoscale Josephson junctions.
  • Characterization of the superinductor's impedance and nonlinearity.
  • Measurement of the Rabi decay time for a superinductor-based qubit.

Main Results:

  • Demonstrated a superinductor with microwave impedance exceeding the resistance quantum.
  • Achieved magnetic field tunability of inductance and nonlinearity.
  • Observed a Rabi decay time exceeding 1 μs for a qubit utilizing the superinductor.

Conclusions:

  • The superinductor offers high kinetic inductance and strong nonlinearity.
  • Potential for developing qubits protected from flux and charge noise.
  • Enables fault-tolerant quantum computing and high-impedance isolation for current standards.