Coupling two charge qubits

Yuri Pashkin, Tsuyoshi Yamamoto, Oleg Astafiev, Yasunobu Nakamura, Dmitri Averin, Jaw Shen Tsai

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Pages (from-to)273-277
Number of pages5
JournalNEC Research and Development
Issue number3
Publication statusPublished - Jul 2003
Externally publishedYes


  • Decoherence
  • Entanglement
  • Josephson junction
  • Quantum computer
  • Qubits


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