Quantum nondemolition measurements of a flux qubit coupled to a noisy detector

Abstract

We theoretically study the measurement-induced dephasing caused by back action noise in quantum nondemolition measurements of a superconducting flux qubit which is coupled to a superconducting quantum interference device (SQUID). Our analytical results indicate that information on qubit flows from qubit to detector, while quantum fluctuations which may cause dephasing of the qubit also inject to qubit. Furthermore, the measurement probability is frequency dependent in a short time scale and has a close relationship with the measurement-induced dephasing. When the detuning between driven and bare resonator equals coupling strength, we will access the state of qubit more easily. In other words, we obtain the maximum measurement rate. Finally, we analyzed mixed effect caused by coupling between non-diagonal term and external variable. We found that the initial information of qubit is destroyed due to quantum tunneling between the qubit states.

6 pages, 3 figures

References in corpus (11)

• Quantum Theory of Cavity-Assisted Sideband Cooling of Mechanical Motion
• Self-cooling of a micro-mirror by radiation pressure
• Preparation and Detection of a Mechanical Resonator Near the Ground State of Motion
• Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting
• Dispersive regime of circuit QED: photon-dependent qubit dephasing and relaxation rates
• Quantum trajectory approach to circuit QED: Quantum jumps and the Zeno effect
• Quantum-Limited Measurement and Information in Mesoscopic Detectors
• Role of relaxation in the quantum measurement of a superconducting qubit using a nonlinear oscillator
• The information about the state of a qubit gained by a weakly coupled detector
• Cavity QED nondemolition measurement scheme using quantized atomic motion
• Quantum non-demolition measurements of a qubit coupled to a harmonic oscillator