Dmitri V. Averin

Quantum oscillations in two coupled charge qubits

A practical quantum computer, if built, would consist of a set of coupled two-level quantum systems (qubits). Among the variety of qubits implemented, solid-state qubits are of particular interest because of their potential suitability for integrated devices. A variety of qubits based on Josephson junctions have been implemented; these exploit the coherence of Cooper-pair tunnelling in the superconducting state. Despite apparent progress in the implementation of individual solid-state qubits, there have been no experimental reports of multiple qubit gates—a basic requirement for building a real quantum computer. Here we demonstrate a Josephson circuit consisting of two coupled charge qubits. Using a pulse technique, we coherently mix quantum states and observe quantum oscillations, the spectrum of which reflects interaction between the qubits. Our results demonstrate the feasibility of coupling multiple solid-state qubits, and indicate the existence of entangled two-qubit states.

ac Josephson Effect in a Single Quantum Channel.

We have calculated all the components of the current in a short one-dimensional channel between two superconductors for arbitrary voltages and transparencies

Efficient Peltier refrigeration by a pair of normal metal/insulator/superconductor junctions

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Adiabatic quantum computation with Cooper pairs

of the channel. We demonstrate that in the ballistic limit (

Continuous weak measurement of quantum coherent oscillations

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Variable electrostatic transformer: controllable coupling of two charge qubits.

) the crossover between the quasistationary evolution of the Josephson phase difference

Experimental realization of a Szilard engine with a single electron

\ensuremath{\phi}

Test of the Jarzynski and Crooks fluctuation relations in an electronic system.

at small voltages and transport by multiple Andreev reflections at larger voltages can be described as the Landau-Zener transition induced by finite reflection in the channel. For perfect transmission and vanishing energy relaxation rates the stationary current-phase relation is never recovered, and

Possible Applications of the Single Charge Tunneling

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SFQ control circuits for Josephson junction qubits

for arbitrary small voltages.