Demonstrating a Driven Reset Protocol of a Superconducting Qubit

Abstract

Qubit reset is crucial at the start of and during quantum information algorithms. We present the experimental demonstration of a practical method to force qubits into their ground state, based on driving certain qubit and cavity transitions. Our protocol, called the double drive reset of population is tested on a superconducting transmon qubit in a three-dimensional cavity. Using a new method for measuring population, we show that we can prepare the ground state with a fidelity of at least 99.5 % in less than 3 microseconds; faster times and higher fidelity are predicted upon parameter optimization.

5 pages, 4 figures

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• Thermal and Residual Excited-State Population in a 3D Transmon Qubit
• Quantum dynamics of an electromagnetic mode that cannot contain N photons
• Quantum State Engineering with Circuit Electromechanical Three-Body Interactions
• Dissipation-induced continuous quantum error correction for superconducting circuits
• Universal two-qubit interactions, measurement and cooling for quantum simulation and computing
• Limits of optimal control yields achievable with quantum controllers
• The quantum transverse-field Ising chain in circuit QED: effects of disorder on the nonequilibrium dynamics
• Copper waveguide cavities with reduced surface loss for coupling to superconducting qubits
• Continuous Generation and Stabilization of Mesoscopic Field Superposition States in a Quantum Circuit