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Related Concept Videos

Voltage Doubler Circuit01:23

Voltage Doubler Circuit

A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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...
Second-Order Circuits01:17

Second-Order Circuits

Integrating two fundamental energy storage elements in electrical circuits results in second-order circuits, encompassing RLC circuits and circuits with dual capacitors or inductors (RC and RL circuits). Second-order circuits are identified by second-order differential equations that link input and output signals.
Input signals typically originate from voltage or current sources, with the output often representing voltage across the capacitor and/or current through the inductor. For example, in...

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Updated: Jun 8, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

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

Published on: August 2, 2019

Switchable ultrastrong coupling in circuit QED.

B Peropadre1, P Forn-Díaz, E Solano

  • 1Instituto de Física Fundamental, CSIC, Serrano 113-bis, 28006 Madrid, Spain.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

We introduce novel designs for switchable coupling between superconducting flux qubits and microwave transmission lines. These designs enable tunable coupling strengths, reaching the ultrastrong coupling regime for advanced quantum applications.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Electrodynamics

Background:

  • Superconducting qubits are promising for quantum computation.
  • Controlling qubit-environment interaction is crucial for quantum technologies.
  • Achieving strong coupling regimes is essential for quantum information processing.

Purpose of the Study:

  • To propose novel designs for switchable coupling between superconducting flux qubits and microwave transmission lines.
  • To explore the possibility of reaching the ultrastrong coupling regime.
  • To identify potential applications for the proposed architectures.

Main Methods:

  • Designing circuits with Josephson junctions in multi-loop configurations.
  • Connecting these circuits to closed (cavity) or open transmission lines.
  • Analyzing the coupling strength modulation and its impact on qubit-photon interaction.

Main Results:

  • Demonstrated designs for switchable coupling.
  • Achieved tunable coupling strengths, enabling the ultrastrong coupling regime.
  • The coupling strength can be comparable to qubit and photon frequencies.

Conclusions:

  • The proposed designs offer a method for dynamically controlling qubit-environment interactions.
  • The ultrastrong coupling regime is accessible with these architectures.
  • These advancements pave the way for new applications in quantum technologies.