Archive for August, 2013

Phys. Rev. B: On-chip cavity quantum phonodynamics with an acceptor qubit in silicon

August 30th, 2013  |  by  |  published in All, Nanotechnology, News, Papers, Phonitons, Quantum Computing

Phys. Rev. B: On-chip cavity quantum phonodynamics with an acceptor qubit in silicon

We describe a chip-based, solid-state analog of cavity-QED utilizing acoustic phonons instead of photons. We show how long-lived and tunable acceptor impurity states in silicon nanomechanical cavities can play the role of a matter nonlinearity for coherent phonons just as, e.g., the Josephson qubit plays in circuit QED. Both strong coupling (number of Rabi oscillations ≲100) and strong dispersive coupling (0.1–2 MHz) regimes can be reached in cavities in the 1–20-GHz range, enabling the control of single phonons, phonon-phonon interactions, dispersive phonon readout of the acceptor qubit, and compatibility with other optomechanical components such as phonon-photon translators. We predict explicit experimental signatures of the acceptor-cavity system.

Preprint: Observation of Autler-Townes effect in a dispersively dressed Jaynes-Cummings system

August 9th, 2013  |  by  |  published in All, News, Preprints, Quantum Computing

Preprint: Observation of Autler-Townes effect in a dispersively dressed Jaynes-Cummings system

Two-tone spectroscopy of a superconducting transmon qubit in a cavity. We find evidence of strongly-coupled atomic physics in these man-made systems.

Superconducting qubits and circuits are a promising technology for a variety of applications, from exploration of physics to quantum information processing or particle detectors.

Tahan Research

http://research.tahan.com/

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