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- Denis Vion, A. Aassime, +5 authors Michel H. Devoret
- Science
- 2002

We have designed and operated a superconducting tunnel junction circuit that behaves as a two-level atom: the "quantronium." An arbitrary evolution of its quantum state can be programmed with a series of microwave pulses, and a projective measurement of the state can be performed by a pulsed readout subcircuit. The measured quality factor of quantum… (More)

We have determined the individual transmission coefficients of Al quantum point contacts containing up to six conduction channels. The determination is based on a comparison of the highly nonlinear current-voltage characteristics in the superconducting state with the predictions of the theory for a single channel superconducting contact. We find that at… (More)

- Grégoire Ithier, Eric Collin, +7 authors Gabriele Schön
- 2005

G. Ithier,1 E. Collin,1 P. Joyez,1 P. J. Meeson,1,2 D. Vion,1 D. Esteve,1 F. Chiarello,3 A. Shnirman,4 Y. Makhlin,4,5 J. Schriefl,4,6 and G. Schön4 1Quantronics Group, Service de Physique de l’Etat Condensé, DSM/DRECAM, CEA Saclay, 91191 Gif-sur-Yvette, France 2Department of Physics, Royal Holloway, University of London, Egham Hill, Egham, Surrey TW20 0EX,… (More)

- Max Hofheinz, Fabien Portier, +5 authors Daniel Esteve
- Physical review letters
- 2011

We explore the photonic (bright) side of the dynamical Coulomb blockade (DCB) by measuring the radiation emitted by a dc voltage-biased Josephson junction embedded in a microwave resonator. In this regime Cooper pair tunneling is inelastic and associated with the transfer of an energy 2eV into the resonator modes. We have measured simultaneously the Cooper… (More)

We have investigated the suppression of single-electron charging effects in metallic single-electron transistors when the conductance of the tunnel junctions becomes larger than the conductance quantum e2yh. We find that the Coulomb blockade of the conductance is progressively shifted at lower temperatures. The experimental results agree quantitatively with… (More)

- Carles Altimiras, Olivier Parlavecchio, +4 authors Fabien Portier
- Physical review letters
- 2014

We observe the suppression of the finite frequency shot noise produced by a voltage biased tunnel junction due to its interaction with a single electromagnetic mode of high impedance. The tunnel junction is embedded in a λ/4 resonator containing a dense SQUID array providing it with a characteristic impedance in the kΩ range and a resonant frequency tunable… (More)

- Olivier Parlavecchio, Carles Altimiras, +7 authors Fabien Portier
- Physical review letters
- 2015

We derive fluctuation-dissipation relations for a tunnel junction driven through a resonator displaying strong quantum fluctuations. We find that the fluctuation-dissipation relations derived for classical external drives hold, provided the effect of the circuit's quantum fluctuations is incorporated into the modified nonlinear current voltage… (More)

- A. Steinbach, Philippe Joyez, +4 authors John M. Martinis
- Physical review letters
- 2001

We have measured the supercurrent flowing through a nonhysteretic, ultrasmall, voltage-biased Josephson junction. In contrast with experiments performed so far on hysteretic Josephson junctions, we find a supercurrent peak whose maximum I(s max) increases as the temperature T decreases. The asymptotic T = 0 value of I(s max) agrees with the junction… (More)

- Helen Le Sueur, Philippe Joyez, Hugues Pothier, Cristián Urbina, Daniel Esteve
- Physical review letters
- 2008

Using a dual-mode STM-AFM microscope operating below 50 mK we measured the local density of states along small normal wires connected at both ends to superconductors with different phases. We observe that a uniform minigap can develop in the whole normal wire and in the superconductors near the interfaces. The minigap depends periodically on the phase… (More)

- Eddy Collin, Grégoire Ithier, A. Aassime, Philippe Joyez, Denis Vion, Daniel Esteve
- Physical review letters
- 2004

Coherent superpositions of quantum states have already been demonstrated in different superconducting circuits based on Josephson junctions. These circuits are now considered for implementing quantum bits. We report on experiments in which the state of a qubit circuit, the quantronium, is efficiently manipulated using methods inspired from nuclear magnetic… (More)