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- Yu A Pashkin, T Yamamoto, O Astafiev, Y Nakamura, D V Averin, J S Tsai
- Nature
- 2003

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… (More)

- D. V. Averin, E. E. Mendez
- 1997

We propose a new variant of the controlled-NOT quantum logic gate based on adiabatic level-crossing dynamics of the q-bits. The gate has a natural implementation in terms of the Cooper pair transport in arrays of small Josephson tunnel junctions. An important advantage of the adiabatic approach is that the gate dynamics is insensitive to the unavoidable… (More)

- Jonne V Koski, Ville F Maisi, Jukka P Pekola, Dmitri V Averin
- Proceedings of the National Academy of Sciences…
- 2014

The most succinct manifestation of the second law of thermodynamics is the limitation imposed by the Landauer principle on the amount of heat a Maxwell demon (MD) can convert into free energy per single bit of information obtained in a measurement. We propose and realize an electronic MD based on a single-electron box operated as a Szilard engine, where kBT… (More)

- D. Averin
- 1995

We have calculated all the components of the current in a short one-dimensional channel between two superconductors for arbitrary voltages and transparencies D of the channel. We demonstrate that in the ballistic limit (D ≃ 1), the crossover between the quasistationary evolution of the Joseph-son phase difference ϕ at small voltages and transport by… (More)

We consider the problem of continuous quantum measurement of coherent oscillations between two quantum states of an individual two-state system. It is shown that the interplay between the information acquisition and the backaction dephasing of the oscillations by the detector imposes a fundamental limit, equal to four, on the signal-to-noise ratio of the… (More)

The talk is devoted to effects of interactions between electrons in isolated mesoscopic grains (quantum dots). We assume that the interaction is moderate not too strong, but not necessarily weak. We demonstrate that under very general conditions the electronic system in such grains can be described by a simple interaction Hamiltonian. This Hamiltonian… (More)

Single-electron charging effects similar to those in small-area metallic tunnel junctions should take place in semiconductor heterostructures, in particular, small-area quantum wells. Our analysis shows that dc current-voltage characteristics of such a well should exhibit an interplay between single-electron charging and energy-quantization effects.… (More)

- D V Averin, C Bruder
- Physical review letters
- 2003

We propose and investigate a novel method for the controlled coupling of two Josephson charge qubits by means of a variable electrostatic transformer. The value of the coupling capacitance is given by the discretized curvature of the lowest energy band of a Josephson junction, which can be positive, negative, or zero. We calculate the charging diagram of… (More)

- M H S Amin, Dmitri V Averin
- Physical review letters
- 2008

We develop a theory of macroscopic resonant tunneling of flux in a double-well potential in the presence of realistic flux noise with a significant low-frequency component. The rate of incoherent flux tunneling between the wells exhibits resonant peaks, the shape and position of which reflect qualitative features of the noise, and can thus serve as a… (More)

- Yu.A. Pashkin, T. Yamamoto, O. Astafiev, Y. Nakamura, D. V. Averin, F. Nori
- 2005

We have analyzed and measured the quantum coherent dynamics of a circuit containing two-coupled superconduc-ting charge qubits. Each qubit is based on a Cooper pair box connected to a reservoir electrode through a Josephson junction. Two qubits are coupled electrostatically by a small island overlapping both Cooper pair boxes. Quantum state manipulation of… (More)