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Related Concept Videos

The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Related Experiment Video

Updated: Dec 26, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Quantum Rifling: Protecting a Qubit from Measurement Back Action.

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Quantum mechanics measurement breaks down for fast-evolving qubits. This new "quantum rifling" regime measures qubits selectively, protecting others from backaction, crucial for scaling quantum processors.

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Area of Science:

  • Quantum Computing
  • Quantum Measurement

Background:

  • Quantum mechanics dictates qubit measurement causes wave function collapse to a discrete eigenstate.
  • Standard measurement protocols can disturb the qubit's state (backaction).

Purpose of the Study:

  • Investigate measurement breakdown in strongly driven qubits.
  • Introduce and characterize the "quantum rifling" regime.
  • Demonstrate selective qubit measurement and backaction suppression.

Main Methods:

  • Studied superconducting qubits coupled to a shared probe field.
  • Applied strong driving during qubit measurement.
  • Analyzed measurement outcomes in the fast-evolving regime.

Main Results:

  • Measurement of a fast-evolving qubit yields a time-averaged expectation value, not an eigenstate.
  • Quantum rifling suppresses measurement backaction.
  • Selective readout of one qubit without disturbing a coupled qubit is demonstrated.

Conclusions:

  • Quantum rifling offers a novel approach to qubit measurement.
  • Enables selective readout multiplexing for scalable quantum processors.
  • Mitigates measurement backaction, a key challenge in quantum computing.