Coherent Control of a Superconducting Qubit with Dynamically Tunable Qubit-cavity Coupling

Abstract

We demonstrate coherent control and measurement of a superconducting qubit coupled to a superconducting coplanar waveguide resonator with a dynamically tunable qubit-cavity coupling strength. Rabi oscillations are measured for several coupling strengths showing that the qubit transition can be turned off by a factor of more than 1500. We show how the qubit can still be accessed in the off state via fast flux pulses. We perform pulse delay measurements with synchronized fast flux pulses on the device and observe $T_1$ and $T_2$ times of 1.6 and 1.9 $\mu$s, respectively. This work demonstrates how this qubit can be incorporated into quantum computing architectures.

4 pages, 4 figures

References in corpus (11)

• Coupling Superconducting Qubits via a Cavity Bus
• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Strong atom-field coupling for Bose-Einstein condensates in an optical cavity on a chip
• Coherent quantum state storage and transfer between two phase qubits via a resonant cavity
• Controllable coupling of superconducting flux qubits
• Tunable coupling in circuit quantum electrodynamics with a superconducting V-system
• A superconducting qubit with Purcell protection and tunable coupling
• Demonstration of a Tuneable Coupler for Superconducting Qubits Using Coherent, Time Domain, Two-Qubit Operations
• High-fidelity gates in a Josephson qubit
• Quantum process tomography of two-qubit controlled-Z and controlled-NOT gates using superconducting phase qubits
• Preparation of Subradiant States using Local Qubit Control in Circuit QED

Cited by in corpus (29)

• Microwave photonics with superconducting quantum circuits
• Superconducting Quantum Computing: A Review
• Suppression of photon shot noise dephasing in a tunable coupling superconducting qubit
• Encoding a Qubit into a Cavity Mode in Circuit-QED using Phase Estimation
• Tunability of microwave transitions as a signature of coherent parity mixing effects in the Majorana-Transmon qubit
• Tunable and Switchable Coupling Between Two Superconducting Resonators
• Time-Reversal Symmetrization of Spontaneous Emission for High Fidelity Quantum State Transfer
• Implementation of pairwise longitudinal coupling in a three-qubit superconducting circuit
• Universal fluctuations and squeezing in generalized Dicke model near the superradiant phase transition
• Robust quantum state transfer using tunable couplers
• Selective darkening of degenerate transitions for implementing quantum controlled-NOT gates
• Violation of Bell's Inequality in Electromechanics
• Coherent control theory and experiment of optical phonons in diamond
• A V-shape superconducting artificial atom based on two inductively coupled transmons
• Reconstructing the quantum state of oscillator networks with a single qubit
• Dynamical Lamb effect versus dissipation in superconducting quantum circuits
• Coherently opening a high-Q cavity
• Weakly Flux-Tunable Superconducting Qubit
• Multi-mode superconducting circuits for realizing strongly coupled multi-qubit processor units
• Resonant and off-resonant microwave signal manipulation in coupled superconducting resonators
• Parametrically driven hybrid qubits-photon systems: dissipation-induced quantum entanglement and photon production from vacuum
• Efficient decoupling of a non-linear qubit mode from its environment
• From edge to bulk: Cavity induced displacement of topological non-local qubits
• Three-qubit direct dispersive parity measurement with Tunable Coupling Qubits
• Suppressed crosstalk between two-junction superconducting qubits with mode-selective exchange coupling
• Speeding up antidynamical Casimir effect with nonstationary qutrits
• Tunable interaction of superconducting flux qubits in circuit QED
• Fluctuations and photon statistics in quantum metamaterial near the superradiant transition
• Third-order exceptional surface in a pseudo-Hermitian superconducting circuit