Superconducting tunable flux qubit with direct readout scheme

Abstract

We describe a simple and efficient scheme for the readout of a tunable flux qubit, and present preliminary experimental tests for the preparation, manipulation and final readout of the qubit state, performed in incoherent regime at liquid Helium temperature. The tunable flux qubit is realized by a double SQUID with an extra Josephson junction inserted in the large superconducting loop, and the readout is performed by applying a current ramp to the junction and recording the value for which there is a voltage response, depending on the qubit state. This preliminary work indicates the feasibility and efficiency of the scheme.

10 pages, 5 figures

References in corpus (4)

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Manipulating the Quantum State of an Electrical Circuit
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Quantum oscillations in two coupled charge qubits

Cited by in corpus (8)

• Experimental Demonstration of a Robust and Scalable Flux Qubit
• Sign- and magnitude-tunable coupler for superconducting flux qubits
• Probing Noise in Flux Qubits via Macroscopic Resonant Tunneling
• Tunable coupling between three qubits as a building block for a superconducting quantum computer
• Tunable Flux Qubit manipulated by fast pulses: operating requirements, dissipation and decoherence
• Real-time simulation of flux qubits used for quantum annealing
• A tunable rf SQUID manipulated as flux and phase qubit
• Quantum instability in a dc-SQUID with strongly asymmetric dynamical parameters