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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)

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)

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. 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)

The existing theory of correlated single-electron tunneling in the double normal-metal tunnel junction is extended to the case of an ultrasmall central electrode of the structure. It is shown that the form of the I-V curve of such a system depends on the energy relaxation rate in this electrode. For realistic values of the relaxation rate, the large-scale… (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)

- M M Leivo, J P Pekola, D V Averin
- 1995

We suggest and demonstrate in experiment that two normal metal /insulator/ superconductor (NIS) tunnel junctions combined in series to form a symmetric SINIS structure can operate as an efficient Peltier refrigerator. Specifically, it is shown that the SINIS structure with normal-state junction resistances 1.0 and 1.1 kΩ is capable of reaching a temperature… (More)

We develop a theory of quadratic quantum measurements by a mesoscopic detector. It is shown that the quadratic measurements should have nontrivial quantum information properties, providing, for instance, a simple way of entangling two noninteracting qubits. We also calculate the output spectrum of a detector with both linear and quadratic response,… (More)

We have developed a quantitative theory of resonant tunneling of magnetic flux between discrete macro-scopically distinct quantum states in superconducting quantum interference device systems. The theory is based on the standard density-matrix approach. Its elements include the discussion of the two different relaxation mechanisms that exist for the… (More)