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Electromagnetic Fields01:30

Electromagnetic Fields

Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
However, the observation of Gauss's...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Related Experiment Video

Updated: Jun 29, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

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Few-photon microwave fields for superconducting transmon-based qudit control.

Irina A Solovykh1,2, Andrey V Pashchenko1,3,4, Natalya A Maleeva5

  • 1Lomonosov Moscow State University, Faculty of Physics, Moscow, 119991, Russia.

Beilstein Journal of Nanotechnology
|September 17, 2025
PubMed
Summary
This summary is machine-generated.

Researchers propose using nonclassical fields to control superconducting atoms, enabling faster and more efficient quantum computations. This method allows precise population of higher energy levels in qudits for advanced quantum processors.

Keywords:
Josephson “atoms”non-classical fieldsquantum state controlsuperconducting qubits

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Control

Background:

  • Quantum processor efficiency can be improved by using multi-level quantum elements (qudits) instead of two-level qubits.
  • Transmon-based superconducting atoms are a promising platform for qudits, but require novel control techniques.

Purpose of the Study:

  • To develop a new method for controlling superconducting qudits using nonclassical fields.
  • To demonstrate efficient and rapid population of specific energy levels in qudits.

Main Methods:

  • Theoretical analysis of qudit control using nonclassical fields.
  • Proposing a quantum circuit design for a superconducting transmon system.

Main Results:

  • Nonclassical fields enable efficient population of high energy levels from the ground state on demand.
  • Control over level population is achieved by tuning the frequency difference between the superconducting atom and the field mode.
  • High energy levels can be populated within a sub-nanosecond timescale.

Conclusions:

  • The proposed nonclassical field approach offers a viable solution for rapid and precise control of transmon-based qudits.
  • This method paves the way for enhanced quantum processor efficiency through advanced qudit control.