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- N. Bergeal, Rajamani Vijay, +4 authors Michel H. Devoret
- 2010

Amplifiers are crucial in every experiment carrying out a very sensitive measurement. However, they always degrade the information by adding noise. Quantum mechanics puts a limit on how small thisâ€¦ (More)

A central feature of quantum mechanics is that a measurement result is intrinsically probabilistic. Consequently, continuously monitoring a quantum system will randomly perturb its natural unitaryâ€¦ (More)

- Rajamani Vijay, Chris Macklin, +5 authors Irfan Siddiqi
- Nature
- 2012

The act of measurement bridges the quantum and classical worlds by projecting a superposition of possible states into a single (probabilistic) outcome. The timescale of this â€˜instantaneousâ€™ processâ€¦ (More)

- Lafe Spietz, Konrad W. Lehnert, Irfan Siddiqi, Robert J. Schoelkopf
- Science
- 2003

We present a thermometer based on the electrical noise from a tunnel junction. In this thermometer, temperature is related to the voltage across the junction by a relative noise measurement with onlyâ€¦ (More)

- Irfan Siddiqi, Rajamani Vijay, +5 authors Michel H. Devoret
- Physical review letters
- 2004

We have constructed a new type of amplifier whose primary purpose is the readout of superconducting quantum bits. It is based on the transition of a rf-driven Josephson junction between two distinctâ€¦ (More)

- Chris Macklin, Kieran S. Oâ€™Brien, +5 authors Irfan Siddiqi
- Science
- 2015

Detecting singleâ€“photon level signalsâ€”carriers of both classical and quantum informationâ€”is particularly challenging for low-energy microwave frequency excitations. Here we introduce aâ€¦ (More)

- Rajamani Vijay, Michel H. Devoret, Irfan Siddiqi
- The Review of scientific instruments
- 2009

We review the theory, fabrication, and implementation of the Josephson bifurcation amplifier (JBA). At the core of the JBA is a nonlinear oscillator based on a reactively shunted Josephson junction.â€¦ (More)

- R. Robertazzi, Irfan Siddiqi, O. A. Mukhanov
- IEEE Transactions on Applied Superconductivity
- 1997

As the integration level of superconducting digital circuits increases, flux trapping in these devices becomes a serious problem. High resolution A/D converters and other high speed signal processingâ€¦ (More)

A Josephson tunnel junction which is rf driven near a dynamical bifurcation point can amplify quantum signals. However, the bifurcation point will exist robustly only if the electrodynamicâ€¦ (More)

- Irfan Siddiqi
- 2002

Critical Temperature Dependence of High Frequency Electron Dynamics in Superconducting Hot-Electron Bolometer Mixers Irfan Siddiqi May, 2002 Superconducting diffusion-cooled hot-electron bolometerâ€¦ (More)