Quantum caustics in resonance fluorescence trajectories

  1. M. Naghiloo,
  2. D. Tan,
  3. P. M. Harrington,
  4. P. Lewalle A. N. Jordan,
  5. and K. W. Murch
We employ phase-sensitive amplification to perform homodyne detection of the resonance fluorescence from a driven superconducting artificial atom. Entanglement between the emitter and

State-Signal Correlations of a Continuously Monitored Superconducting Qubit

  1. N. Foroozani,
  2. M. Naghiloo,
  3. D. Tan,
  4. K. Mølmer,
  5. and K. W. Murch
A superconducting transmon qubit undergoing driven unitary evolution is continuously monitored to observe the time evolution of its quantum state. If projective measurements are used

Weak Measurement and Feedback in Superconducting Quantum Circuits

  1. K. W. Murch,
  2. R. Vijay,
  3. and I. Siddiqi
We describe the implementation of weak quantum measurements in superconducting qubits, focusing specifically on transmon type devices in the circuit quantum electrodynamics architecture.

Quantum trajectories of superconducting qubits

  1. S. J. Weber,
  2. K. W. Murch,
  3. M. E. Schwartz,
  4. N. Roch,
  5. and I. Siddiqi
In this review, we discuss recent experiments that investigate how the quantum sate of a superconducting qubit evolves during measurement. We provide a pedagogical overview of the measurement

Prediction and retrodiction for a continuously monitored superconducting qubit

  1. D. Tan,
  2. S. Weber,
  3. I. Siddiqi,
  4. K. Mølmer,
  5. and K. W. Murch
The quantum state of a superconducting transmon qubit inside a three-dimensional cavity is monitored by reflection of a microwave field on the cavity. The information inferred from

Observing single quantum trajectories of a superconducting qubit

  1. K. W. Murch,
  2. S. J. Weber,
  3. C. Macklin,
  4. and I. Siddiqi
The length of time that a quantum system can exist in a superposition state is determined by how strongly it interacts with its environment. This interaction entangles the quantum state

Quantum State Sensitivity of an Autoresonant Superconducting Circuit

  1. K. W. Murch,
  2. E. Ginossar,
  3. S. J. Weber,
  4. R. Vijay,
  5. S.M. Girvin,
  6. and I. Siddiqi
When a frequency chirped excitation is applied to a classical high-Q nonlinear oscillator, its motion becomes dynamically synchronized to the drive and large oscillation amplitude is

Cavity-assisted quantum bath engineering

  1. K. W. Murch,
  2. U. Vool,
  3. D. Zhou,
  4. S. J. Weber,
  5. S. M. Girvin,
  6. and I. Siddiqi
We demonstrate quantum bath engineering for a superconducting artificial atom coupled to a microwave cavity. By tailoring the spectrum of microwave photon shot noise in the cavity,

Quantum feedback control of a superconducting qubit: Persistent Rabi oscillations

  1. R. Vijay,
  2. C. Macklin,
  3. D. H. Slichter,
  4. S. J. Weber,
  5. K. W. Murch,
  6. R. Naik,
  7. A. N. Korotkov,
  8. and I. Siddiqi
The act of measurement bridges the quantum and classical worlds by projecting a superposition of possible states into a single, albeit probabilistic, outcome. The time-scale of this