Strong tunable coupling between a superconducting charge and phase qubit

Details Strong tunable coupling between a superconducting charge and phase qubit Strong tunable coupling between a superconducting charge and phase qubit

2007-12-24

arxiv.org/abs/0712.3970v1

Physical Review Letters 100 (2008) 187003

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages

Scientific paper

10.1103/PhysRevLett.100.187003

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 measurements of the charge qubit's quantum states is performed by resonant read-out via the measurement of the quantum states of the SQUID. The measured coupling strength is in agreement with an analytic theory including a capacitive and a tunable Josephson coupling between the two qubits.

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