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Incoherent Qubit Control Using the Quantum Zeno Effect.

S Hacohen-Gourgy1,2, L P García-Pintos3,4, L S Martin1,2

  • 1Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA.

Physical Review Letters
|January 30, 2018
PubMed
Summary
This summary is machine-generated.

Repeated quantum measurements can control qubit states by tracking a slowly changing observable. This technique offers built-in error detection and enables adaptive quantum feedback protocols.

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Area of Science:

  • Quantum Information Science
  • Quantum Control
  • Quantum Measurement

Background:

  • The quantum Zeno effect suppresses system evolution via repeated observations, locking it to an eigenstate.
  • Controlling quantum states typically requires active feedback or engineered Hamiltonians.

Purpose of the Study:

  • To demonstrate state control using only measurement by dynamically varying an observable.
  • To implement a measurement-based feedback mechanism for quantum systems.

Main Methods:

  • Utilizing a circuit-Quantum Electrodynamics (circuit-QED) readout to couple with a qubit's controllable observable.
  • Implementing continuous monitoring of measurement records for real-time state tracking.
  • Employing postselection on high-fidelity realizations to validate the technique.

Main Results:

  • Successfully controlled the qubit state by slowly varying the measurement observable.
  • Demonstrated the ability to detect deviations from the target eigenstate.
  • Achieved high fidelity in state preparation and maintenance.

Conclusions:

  • Dynamical measurement operators provide a novel method for quantum state control.
  • This technique offers inherent error detection capabilities.
  • The approach is applicable to advanced quantum feedback, adaptive measurements, and state purification.