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Switching of BJT

Switching of BJT

Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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Current Growth And Decay In RL Circuits

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The current growth and decay in RL circuits can be understood by considering a series RL circuit consisting of a resistor, an inductor, a constant source of emf, and two switches. When the first switch is closed, the circuit is equivalent to a single-loop circuit consisting of a resistor and an inductor connected to a source of emf. In this case, the source of emf produces a current in the circuit. If there were no self-inductance in the circuit, the current would rise immediately to a steady...

Oscillations In An LC Circuit

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by

Biasing of FET

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First-Order Circuits

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Related Experiment Video

Updated: Apr 12, 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

Exploring the quantum critical behaviour in a driven Tavis-Cummings circuit.

M Feng¹, Y P Zhong², T Liu³

¹State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.

Nature Communications

|May 15, 2015

Summary

Researchers experimentally observed a four-qubit nonequilibrium quantum phase transition using superconducting artificial atoms. This study demonstrates a new method for exploring quantum critical phenomena in engineered quantum systems.

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Area of Science:

Condensed-matter physics
Quantum simulation
Quantum information science

Background:

Quantum phase transitions are crucial in many-body systems.
Superconducting qubits offer a controllable platform for quantum simulation.
Exploring quantum phase transitions in artificial atoms is a key research area.

Purpose of the Study:

To experimentally demonstrate quantum critical behavior in a controllable superconducting circuit.
To realize and explore a four-qubit nonequilibrium quantum phase transition.
To investigate the potential of engineered quantum simulators for studying quantum phase transitions.

Main Methods:

Utilized a superconducting circuit with four coupled qubits and a common resonator.
Employed off-resonant driving to renormalize the critical spin-field coupling strength.
Dynamically swept the critical coupling strength and monitored four-qubit scaled moments.

Main Results:

Observed a four-qubit nonequilibrium quantum phase transition.
Experimental results align with the driven Tavis-Cummings theory under decoherence.
Detected signatures of structural changes in the system's eigenstates.

Conclusions:

Demonstrated a novel experimental approach for studying quantum phase transitions.
The engineered quantum simulator provides a platform for exploring scaling behaviors, parity breaking, and long-range quantum correlations.
This work advances the understanding and experimental exploration of quantum critical phenomena in artificial quantum systems.