Dispersive Charge and Flux Qubit Readout as a Quantum Measurement Process

Details Dispersive Charge and Flux Qubit Readout as a Quantum Measurement Process Dispersive Charge and Flux Qubit Readout as a Quantum Measurement Process

2006-10-26

arxiv.org/abs/cond-mat/0610732v1

Physics

Condensed Matter

Superconductivity

26 pages, 3 figures, To be published in Journal of Low Temperature Physics

Scientific paper

We analyze the dispersive readout of superconducting charge and flux qubits as a quantum measurement process. The measurement oscillator frequency is considered much lower than the qubit frequency. This regime is interesting because large detuning allows for strong coupling between the measurement oscillator and the signal transmission line, thus allowing for fast readout. Due to the large detuning we may not use the rotating wave approximation in the oscillator-qubit coupling. Instead we start from an approximation where the qubit follows the oscillator adiabatically, and show that non-adiabatic corrections are small. We find analytic expressions for the measurement time, as well as for the back-action, both while measuring and in the off-state. The quantum efficiency is found to be unity within our approximation, both for charge and flux qubit readout.

Affiliated with

Also associated with

No associations

Rating

Dispersive Charge and Flux Qubit Readout as a Quantum Measurement Process does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dispersive Charge and Flux Qubit Readout as a Quantum Measurement Process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dispersive Charge and Flux Qubit Readout as a Quantum Measurement Process will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-114009