33.50.+n Nanomechanical resonators <-> quantum dots, superconducting qubits
Detecting phonon blockade with photons
Tue, 2011-09-20 16:03 - Ingo KamleitnerPhys. Rev. B 84, 054503 (2011)
Measuring the quantum dynamics of a mechanical system, when few phonons are involved, remains a challenge. We show that a superconducting microwave resonator linearly coupled to the mechanical mode constitutes a very powerful probe for this scope. This new coupling can be much stronger than the usual radiation pressure interaction by adjusting a gate voltage. We focus on the detection of phonon blockade, showing that it can be observed by measuring the statistics of the light in the cavity. The underlying reason is the formation of an entangled state between the two resonators.
Weak continuous monitoring of a flux qubit using coplanar waveguide resonator
Mon, 2011-02-14 19:08 - Daniel RudolphPhys. Rev. B 81, 172505 (2010)
We study a flux qubit in a coplanar waveguide resonator by measuring transmission through the system. In our system with the flux qubit decoupled galvanically from the resonator, the intermediate coupling regime is achieved. In this regime, dispersive readout is possible with weak back action on the qubit. The detailed theoretical analysis and simulations give good agreement with the experimental data and allow us to make the qubit characterization.
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