Strong Tunable Coupling between a Superconducting Charge and Phase Qubit

2007/12/24 by Aurélien Fay, A. Fay, Emile Hoskinson +9 · 2 citations
Computer Science · Physics and Astronomy · #Mechanical and Optical Resonators #Quantum Information and Cryptography #Quantum and electron transport phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.100.187003

published as Physical Review Letters 100 (2008) 187003 · 5 pages

arxiv created 2007/12/24 · openalex publication_date 2008/05/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We have realized a tunable coupling over a large frequency range between an asymmetric Cooper pair transistor (charge qubit) and a dc SQUID (phase qubit). Our circuit enables the independent manipulation of the quantum states of each qubit as well as their entanglement. The measurement of the charge qubit's quantum states is performed by an adiabatic quantum transfer from the charge to the phase qubit. The measured coupling strength is in agreement with an analytic theory including a capacitive and a tunable Josephson coupling between the two qubits.

Citations

• Manipulating quantum entanglement with atoms and photons in a cavity
• Cavity quantum electrodynamics for superconducting electrical circuits: An architecture for quantum computation
• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• Coupling superconducting qubits via a cavity bus

Cited by

• Entanglement degradation in the solid state: Interplay of adiabatic and quantum noise
• Optimal tuning of solid-state quantum gates: A universal two-qubit gate