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This summary is machine-generated.

Quantum measurements can control qubit decay. This study demonstrates both Zeno and anti-Zeno effects using a superconducting qubit, showing that energy measurements aren't required to influence decay rates.

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Area of Science:

  • Quantum Information Science
  • Quantum Measurement and Control
  • Superconducting Quantum Systems

Background:

  • The Zeno and anti-Zeno effects describe how frequent quantum measurements can inhibit or accelerate the decay of quantum states.
  • These effects depend critically on system-environment interactions and the chosen measurement techniques.
  • Understanding these phenomena is crucial for developing robust quantum technologies.

Purpose of the Study:

  • To experimentally map out both Zeno and anti-Zeno effects in a superconducting qubit.
  • To investigate the influence of structured noise baths and variable measurement rates on these effects.
  • To compare the impact of energy measurements versus purely dephasing quasimeasurements on qubit decay.

Main Methods:

  • Utilized a superconducting qubit as the quantum system.
  • Implemented variable measurement rates and exposed the qubit to structured noise baths.
  • Performed both dispersive energy measurements and purely dephasing quasimeasurements.

Main Results:

  • Observed both suppression (Zeno effect) and acceleration (anti-Zeno effect) of qubit decay by adjusting measurement frequency.
  • Demonstrated that repeated measurements modulate the qubit spectrum, causing it to sample different parts of the noise bath.
  • Showed that purely dephasing quasimeasurements can induce Zeno and anti-Zeno effects, similar to energy measurements.

Conclusions:

  • The Zeno and anti-Zeno effects can be reliably controlled in superconducting qubits via measurement.
  • Structured noise baths and measurement rates significantly influence the observed quantum evolution.
  • Energy measurements are not a prerequisite for achieving Zeno or anti-Zeno effects; quasimeasurements are sufficient.