Analytical approach to swift nonleaky entangling gates in superconducting qubits

2014/11/30 by Sophia E. Economou, Edwin Barnes · 54 citations
Computer Science · Engineering · Physics and Astronomy · #Computer science #Electrical engineering #Engineering #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum gate #Quantum mechanics #Qubit #Superconducting quantum computing #Superconductivity #Topology (electrical circuits) #cond-mat.mes-hall #quant-ph

paper · pdf · doi:10.1103/physrevb.91.161405

published in Physical Review B 91(16) (American Physical Society) · 5 pages, 4 figures

arxiv created 2015/04/09 · openalex publication_date 2015/04/09 · arxiv updated 2015/04/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We develop schemes for designing pulses that implement fast and precise entangling quantum gates in superconducting qubit systems despite the presence of nearby harmful transitions. Our approach is based on purposely involving the nearest harmful transition in the quantum evolution instead of trying to avoid it. Using analytical tools, we design simple microwave control fields that implement maximally entangling gates with fidelities exceeding 99% in times as low as 40 ns. We demonstrate our approach in a two-qubit circuit QED system by designing the two most important quantum entangling gates: a conditional-not gate and a conditional-z gate. Our results constitute an important step toward overcoming the problem of spectral crowding, one of the primary challenges in controlling multiqubit systems.

Citations

• Charge insensitive qubit design derived from the Cooper pair box
• Fidelity of quantum operations
• Complete universal quantum gate set approaching fault-tolerant thresholds with superconducting qubits
• Implementing the Quantum von Neumann Architecture with Superconducting Circuits
• Demonstration of two-qubit algorithms with a superconducting quantum processor
• Implementing a strand of a scalable fault-tolerant quantum computing fabric
• Direct Observation of Coherent Population Trapping in a Superconducting Artificial Atom
• Simple Pulses for Elimination of Leakage in Weakly Nonlinear Qubits
• Implementation of a Toffoli Gate with Superconducting Circuits
• Measurement-based quantum computation with cluster states
• Coupling superconducting qubits via a cavity bus

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