Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:cond-mat/0212314 · Nature

Quantum oscillations in two coupled charge qubits

Yu. A. Pashkin, Tsuyoshi Yamamoto, O. V. Astafiev, Yasunobu Nakamura, D. V. Averin, Jaw-Shen Tsai

Published Feb 1, 2003• 712 citations
arXivHTMLPDF
DOI
10.1038/nature01365

Related papers

Correlated Coherent Oscillations in Coupled Semiconductor Charge Qubits

利正 藤澤, T. Fujisawa

•Jan 1, 2009•0 citations

Coupling two charge qubits

Yu. A. Pashkin, Tsuyoshi Yamamoto, O. V. Astafiev +3 more

We demonstrate a Josephson circuit consisting of two electrostatically coupled charge quantum bits (qubits). Using a pulse technique, we coherently mix quantum states and observe quantum oscillation, the spectrum of which reflects interaction between the qubits. Our results demonstrate feasibility of coupling multiple solid-state qubits, and indicate the existence of entangled two-qubit states.

Nec Research & Development•Jul 1, 2003•1 citation

Quantum Oscillations in Two Coupled Charge Qubits

Yu. A. Pashkin, Tsuyoshi Yamamoto, O. V. Astafiev +3 more

A practical quantum computer, if built, would consist of a set of coupled two-level quantum systems (qubits). Among the variety of qubits implemented, solid-state qubits are of particular interest because of their potential suitability for integrated devices. A variety of qubits based on Josephson junctions have been implemented; these exploit the coherence of Cooper-pair tunnelling in the superconducting state. Despite apparent progress in the implementation of individual solid-state qubits, there have been no experimental reports of multiple qubit gates--a basic requirement for building a real quantum computer. Here we demonstrate a Josephson circuit consisting of two coupled charge qubits. Using a pulse technique, we coherently mix quantum states and observe quantum oscillations, the spectrum of which reflects interaction between the qubits. Our results demonstrate the feasibility of coupling multiple solid-state qubits, and indicate the existence of entangled two-qubit states.

International Conference on Solid State Devices and Materials (SSDM)•Sep 18, 2003•4 citations

Charge Qubit Coupled to Quantum

Telegraph Noise

•Jan 1, 2012•0 citations

Engineering Progressive Decoherence with Quantum Jumps in Charge Qubit

Y. D. Wang, Gao, Y. B., C. P. Sun

For the Josephson junction charge qubits with macroscopically quantum natures, we propose a theoretical scheme to observe the loss of quantum coherence through coupling such qubit system to an engineered reservoir, the harmonic oscillator mode in the LC circuit formed by the inductor and the separated capacitors. Similar to the usual cavity QED system in form, this charge qubit system with engineered couplings shows the quantum jumps (C.P.Sun et al Fortschr. Phys. \textbf{43}, 585 (1995))in a progressive decoherence process. Corresponding to two components of superposition of two charge states, the inductor evolves simultaneously towards two distinct quasi-classical states entangling with two states of the charge qubit. Then it induces the quantum decoherence for the induced squeezing macroscopically in the LC mode.

arXiv:quant-ph/0212088•Dec 14, 2002•0 citations

Dynamics of a Qubit Coupled to a Harmonic Oscillator

Patrice Bertet, I. Chiorescu, Kouichi Semba +2 more

Springer eBooks•May 29, 2006•0 citations
A practical quantum computer, if built, would consist of a set of coupled two-level quantum systems (qubits). Among the variety of qubits implemented, solid-state qubits are of particular interest because of their potential suitability for integrated devices. A variety of qubits based on Josephson junctions have been implemented; these exploit the coherence of Cooper-pair tunnelling in the superconducting state. Despite apparent progress in the implementation of individual solid-state qubits, there have been no experimental reports of multiple qubit gates--a basic requirement for building a real quantum computer. Here we demonstrate a Josephson circuit consisting of two coupled charge qubits. Using a pulse technique, we coherently mix quantum states and observe quantum oscillations, the spectrum of which reflects interaction between the qubits. Our results demonstrate the feasibility of coupling multiple solid-state qubits, and indicate the existence of entangled two-qubit states.
For the Josephson junction charge qubits with macroscopically quantum natures, we propose a theoretical scheme to observe the loss of quantum coherence through coupling such qubit system to an engineered reservoir, the harmonic oscillator mode in the LC circuit formed by the inductor and the separated capacitors. Similar to the usual cavity QED system in form, this charge qubit system with engineered couplings shows the quantum jumps (C.P.Sun et al Fortschr. Phys. \textbf{43}, 585 (1995))in a progressive decoherence process. Corresponding to two components of superposition of two charge states, the inductor evolves simultaneously towards two distinct quasi-classical states entangling with two states of the charge qubit. Then it induces the quantum decoherence for the induced squeezing macroscopically in the LC mode.