Demonstration of conditional gate operation using superconducting charge qubits

2003/10/01 by Tsuyoshi Yamamoto, T. Yamamoto, Yu. A. Pashkin +5 · 43 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1038/nature02015

published as Nature 425, 941 (2003)

crossref issued 2003/10/01 · crossref published 2003/10/01 · crossref published-print 2003/10/01 · openalex publication_date 2003/10/01 · crossref created 2003/10/29 · arxiv created 2003/11/04 · arxiv updated 2009/12/01 · crossref deposited 2023/05/18 · openalex created_date 2025/10/10 · crossref indexed 2026/06/12 · openalex updated_date 2026/07/29

Abstract

Since the first demonstration of coherent control of a quantum state of a superconducting charge qubit a variety of Josephson-junction-based qubits have been implemented with remarkable progress in coherence time and read-out schemes. Although the current level of this solid-state device is still not as advanced as that of the most advanced microscopic-system-based qubits, these developments, together with the potential scalability, have renewed its position as a strong candidate as a building block for the quantum computer. Recently, coherent oscillation and microwave spectroscopy in capacitively-coupled superconducting qubits have been reported. The next challenging step toward quantum computation is a realization of logic gates. Here we demonstrate a conditional gate operation using a pair of coupled superconducting charge qubits. Using a pulse technique, we prepare different input states and show that they can be transformed by controlled-NOT (C-NOT) gate operation in the amplitude of the states. Although the phase evolution during the gate operation is still to be clarified, the present results are a major step toward the realization of a universal solid-state quantum gate.

Citations

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Quantum Coherence with a Single Cooper Pair

Cited by

• Coupling superconducting qubits via a cavity bus
• Implementing optimal control pulse shaping for improved single-qubit gates
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• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• Switchable coupling for superconducting qubits using double resonance in the presence of crosstalk
• Low-frequency noise in Josephson junctions for superconducting qubits
• Double SQUID tunable flux qubit manipulated by fast pulses: operation requirements, dissipation and decoherence
• Measurement of the ground-state flux diagram of three coupled qubits as a first step towards the demonstration of adiabatic quantum computation
• Parametric Control of a Superconducting Flux Qubit
• Rabi oscillations in a qubit coupled to a quantum two-level system
• Observation of Quantum Oscillations between a Josephson Phase Qubit and a Microscopic Resonator Using Fast Readout
• n-qubit-controlled phase gate with superconducting quantum-interference devices coupled to a resonator
• Optimal generation of single-qubit operation from an always-on interaction by algebraic decoupling
• Engineering Superposition States and Tailored Probes for Nanoresonators via Open-Loop Control
• Optimal number of controlled-NOT gates to generate a three-qubit state
• Efficient one- and two-qubit pulsed gates for an oscillator-stabilized Josephson qubit
• Quantum circuit for three-qubit random states
• Entanglement degradation in the solid state: Interplay of adiabatic and quantum noise
• High-Contrast Dispersive Readout of a Superconducting Flux Qubit Using a Nonlinear Resonator
• Coupling superconducting flux qubits at optimal point via dynamic decoupling with the quantum bus
• Optimal tuning of solid-state quantum gates: A universal two-qubit gate
• Simple unconventional geometric scenario of one-way quantum computation with superconducting qubits inside a cavity
• Vacuum Rabi Oscillations in a Macroscopic Superconducting QubitLCOscillator System
• Cooper-pair resonances and subgap Coulomb blockade in a superconducting single-electron transistor
• Correlation-induced suppression of decoherence in capacitively coupled Cooper-pair boxes
• Decay of entanglement in coupled, driven systems with bipartite decoherence
• Nonlinear resonant behavior of a dispersive readout circuit for a superconducting flux qubit
• Single-shot measurement of the Josephson charge qubit
• Arbitrary accuracy iterative quantum phase estimation algorithm using a single ancillary qubit: A two-qubit benchmark
• Macroscopic Einstein-Podolsky-Rosen pairs in superconducting circuits
• Interqubit coupling mediated by a high-excitation-energy quantum object
• Quantum storage and information transfer with superconducting qubits
• Method for finding the critical temperature of the island in a SET structure
• Superconducting qubits coupled to nanoelectromechanical resonators: An architecture for solid-state quantum-information processing
• Phase coherent dynamics of a superconducting flux qubit with capacitive bias readout
• Simple Pulses for Elimination of Leakage in Weakly Nonlinear Qubits
• Initial Decoherence in Solid State Qubits
• Readout of solid-state charge qubits using a single-electron pump
• Quantum computing by optical control of electron spins
• Tunable coupling of qubits: Nonadiabatic corrections
• Full control of qubit rotations in a voltage-biased superconducting flux qubit
• Entanglement dynamics in chains of qubits with noise and disorder
• Yasunobu Nakamura [wikipedia]