Spectroscopy of Three-Particle Entanglement in a Macroscopic Superconducting Circuit

Details Spectroscopy of Three-Particle Entanglement in a Macroscopic Superconducting Circuit Spectroscopy of Three-Particle Entanglement in a Macroscopic Superconducting Circuit

2004-09-10

arxiv.org/abs/cond-mat/0409284v2

Phys. Rev. Lett. 94, 027003 (2005)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.94.027003

We study the quantum mechanical behavior of a macroscopic, three-body, superconducting circuit. Microwave spectroscopy on our system, a resonator coupling two large Josephson junctions, produced complex energy spectra well explained by quantum theory over a large frequency range. By tuning each junction separately into resonance with the resonator, we first observe strong coupling between each junction and the resonator. Bringing both junctions together into resonance with the resonator, we find spectroscopic evidence for entanglement between all three degrees of freedom and suggest a new method for controllable coupling of distant qubits, a key step toward quantum computation.

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