Detection of a persistent-current qubit by resonant activation

Abstract

We present the implementation of a new scheme to detect the quantum state of a persistent-current qubit. It relies on the dependency of the measuring Superconducting Quantum Interference Device (SQUID) plasma frequency on the qubit state, which we detect by resonant activation. With a measurement pulse of only 5ns, we observed Rabi oscillations with high visibility (65%).

4 pages, 4 figures, submitted to PRB Rapid Com

References in corpus (1)

• Evidence of two-dimensional macroscopic quantum tunneling of a current-biased DC-SQUID

Cited by in corpus (14)

• Decoherence in a superconducting quantum bit circuit
• Dephasing of a superconducting qubit induced by photon noise
• Observation of quantum oscillations between a Josephson phase qubit and a microscopic resonator using fast readout
• Protocols for optimal readout of qubits using a continuous quantum nondemolition measurement
• Dispersive measurements of superconducting qubit coherence with a fast, latching readout
• Controllable Coupling between Flux Qubit and Nanomechanical Resonator by Magnetic Field
• Dynamics of the quantum Duffing oscillator in the driving induced bistable regime
• Nanosecond quantum state detection in a current biased dc SQUID
• QND measurement of a superconducting qubit in the weakly projective regime
• A superconducting qubit as a quantum transformer routing entanglement between a microscopic quantum memory and a macroscopic resonator
• Theory of solid state quantum information processing
• Mesoscopic Shelving Readout of Superconducting Qubits in Circuit QED
• Entrapment of magnetic micro-crystals for on-chip electron spin resonance studies
• Observation of Higher-Order Sideband Transitions and First-Order Sideband Rabi Oscillations in a Superconducting Flux Qubit Coupled to a SQUID Plasma Mode