Robust Optimal Quantum Gates for Josephson Charge Qubits

2006/11/30 by Simone Montangero, Tommaso Calarco, Rosario Fazio · 1 citation
Computer Science · Physics and Astronomy · #Charge (physics) #Computer science #Josephson effect #Noise (video) #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum error correction #Quantum gate #Quantum mechanics #Qubit #Superconducting quantum computing #Superconductivity #cond-mat.supr-con #quant-ph

paper · pdf · doi:10.1103/physrevlett.99.170501

published as Phys. Rev. Lett. 99, 170501 (2007) · 4 pages, 4 figures

arxiv created 2007/09/05 · openalex publication_date 2007/10/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Quantum optimal control theory allows us to design accurate quantum gates. We employ it to design high-fidelity two-bit gates for Josephson charge qubits in the presence of both leakage and noise. Our protocol considerably increases the fidelity of the gate and, more important, it is quite robust in the disruptive presence of 1/f noise. The improvement in the gate performances discussed in this work (errors approximately 10(-3)-10(-4) in realistic cases) allows us to cross the fault tolerance threshold.

Citations

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Demonstration of conditional gate operation using superconducting charge qubits
• Scalable Quantum Computing with Josephson Charge Qubits
• Coherent dynamics of a Josephson charge qubit
• Parametric Control of a Superconducting Flux Qubit
• Initial Decoherence in Solid State Qubits
• Josephson-junction qubits with controlled couplings
• Quantum-state engineering with Josephson-junction devices
• Low- and High-Frequency Noise from Coherent Two-Level Systems
• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• Optimal control of quantum-mechanical systems: Existence, numerical approximation, and applications
• Quantum computations: algorithms and error correction
• High-fidelity one-qubit operations under random telegraph noise

Cited by

• 1/fnoise: Implications for solid-state quantum information