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Weak Measurement and Feedback in Superconducting Quantum Circuits

  • Kater W. MurchEmail author
  • Rajamani Vijay
  • Irfan Siddiqi
Chapter
Part of the Quantum Science and Technology book series (QST)

Abstract

We describe the implementation of weak quantum measurements in superconducting qubits, focusing specifically on transmon type devices in the circuit quantum electrodynamics architecture. To access this regime, the readout cavity is probed with on average a single microwave photon. Such low-level signals are detected using near quantum-noise-limited superconducting parametric amplifiers. Weak measurements yield partial information about the quantum state, and correspondingly do not completely project the qubit onto an eigenstate. As such, we use the measurement record to either sequentially reconstruct the quantum state at a given time, yielding a quantum trajectory, or to close a direct quantum feedback loop, stabilizing Rabi oscillations indefinitely.

Keywords

Coherent State Entangle State Projective Measurement Qubit State Weak Measurement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Kater W. Murch
    • 1
    Email author
  • Rajamani Vijay
    • 2
  • Irfan Siddiqi
    • 3
  1. 1.Department of PhysicsWashington UniversitySt. LouisUSA
  2. 2.Tata Institute of Fundamental Research, Department of Condensed Matter Physics & Materials ScienceMumbaiIndia
  3. 3.Quantum Nanoelectronics Laboratory, Department of PhysicsUniversity of CaliforniaBerkeleyUSA

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