Using Sideband Transitions for Two-Qubit Operations in Superconducting Circuits

Abstract

We demonstrate time resolved driving of two-photon blue sideband transitions between superconducting qubits and a transmission line resonator. Using the sidebands, we implement a pulse sequence that first entangles one qubit with the resonator, and subsequently distributes the entanglement between two qubits. We show generation of 75% fidelity Bell states by this method. The full density matrix of the two qubit system is extracted using joint measurement and quantum state tomography, and shows close agreement with numerical simulation. The scheme is potentially extendable to a scalable universal gate for quantum computation.

4 pages, 5 figures, version with high resolution figures available at http://qudev.ethz.ch/content/science/PubsPapers.html

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• Benchmarking the noise sensitivity of different parametric two-qubit gates in a single superconducting quantum computing platform
• Optimized pulse shapes for a resonator-induced phase gate
• Many-Body Interactions with Tunable-Coupling Transmon Qubits
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• Circuit QED: single-step realization of a multiqubit controlled phase gate with one microwave photonic qubit simultaneously controlling $n-1$ microwave photonic qubits
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• Universal quantum gate with hybrid qubits in circuit quantum electrodynamics
• One-step implementation of a multi-target-qubit controlled-phase gate with photonic qubits encoded via eigenstates of the photon-number parity operator
• Construction of a qudit using Schrodinger cat states and generation of hybrid entanglement between a discrete-variable qudit and a continuous-variable qudit
• Unravelling the atomic and electronic structure of nanocrystals on superconducting Nb(110): Impact of the oxygen monolayer
• Decay of nonlocality due to adiabatic and quantum noise in the solid state
• One-step implementation of a multi-target-qubit controlled phase gate with cat-state qubits in circuit QED