Macroscopic quantum effects in the zero voltage state of the current biased Josephson junction

Conference · Wed May 01 00:00:00 EDT 1985

OSTI ID:5005593

Clarke, J; Devoret, M H; Martinis, J; Esteve, D

When a weak microwave current is applied to a current-biased Josephson tunnel junction in the thermal limit the escape rate from the zero voltage state is enhanced when the microwave frequency is near the plasma frequency of the junction. The resonance curve is markedly asymmetric because of the anharmonic properties of the potential well: this behavior is well explained by a computer simulation using a resistively shunted junction model. This phenomenon of resonant activation enables one to make in situ measurements of the capacitance and resistance shunting the junction, including contributions from the complex impedance presented by the current leads. For the relatively large area junctions studied in these experiments, the external capacitive loading was relatively unimportant, but the damping was entirely dominated by the external resistance.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5005593
• Report Number(s): LBL-19652; CONF-8506203-3; ON: DE86001985
• Resource Relation: Conference: 3. international conference on superconducting quantum devices, Berlin, F.R. Germany, 25 Jun 1985; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
JOSEPHSON JUNCTIONS
RESONANCE
COMPUTERIZED SIMULATION
DAMPING
MICROWAVE RADIATION
SOLID-STATE PLASMA
ELECTROMAGNETIC RADIATION
JUNCTIONS
PLASMA
RADIATIONS
SIMULATION
SUPERCONDUCTING JUNCTIONS
656102* - Solid State Physics- Superconductivity- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena- (-1987)