Superconducting Devices to Test Macroscopic Quantum Coherence on the Flux States of a Rf SQUID

2001 ◽  
pp. 73-82
Author(s):  
C. Cosmelli ◽  
P. Cappelletti ◽  
P. Carelli ◽  
M. G. Castellano ◽  
F. Chiarello ◽  
...  
Keyword(s):  
Quantum Coherence ◽  
Superconducting Devices ◽  
Macroscopic Quantum ◽  
Macroscopic Quantum Coherence ◽  
Rf Squid

RF SQUID BASED DEVICES FOR MQC

2003 ◽  
Vol 17 (04n06) ◽  
pp. 762-767
Author(s):  
L. LONGOBARDI ◽  
V. CORATO ◽  
C. GRANATA ◽  
S. ROMBETTO ◽  
M. RUSSO ◽  
...  
Keyword(s):  
Classical Limit ◽  
Quantum Coherence ◽  
Readout System ◽  
Macroscopic Quantum ◽  
Preliminary Results ◽  
Different Types ◽  
Report Data ◽  
Macroscopic Quantum Coherence ◽  
Rf Squid ◽  
Flux State

We present different types of integrated planar SQUID devices in view of Macroscopic Quantum Coherence (MQC) experiments. These devices include an rf SQUID as a probe to test the MQC, coupled to a readout system based on a dc SQUID sensor. Both dc SQUID and flux transformer are in a gradiometric configuration to minimize the electromagnetic noise from environment. We report data on dc SQUID performances as well as preliminary results on the decay from the metastable flux state for rf SQUID-based devices above the crossover temeperature (classical limit).

rf SQUID system for macroscopic quantum coherence experiments

2002 ◽  
Vol 372-376 ◽  
pp. 185-188 ◽  
Author(s):  
C. Granata ◽  
V. Corato ◽  
L. Longobardi ◽  
M. Russo ◽  
B. Ruggiero ◽  
...  
Keyword(s):  
Quantum Coherence ◽  
Macroscopic Quantum ◽  
Macroscopic Quantum Coherence ◽  
Rf Squid ◽  
Squid System

MACROSCOPIC QUANTUM COHERENCE IN JOSEPHSON SYSTEMS

2000 ◽  
Vol 14 (25n27) ◽  
pp. 3050-3055 ◽  
Author(s):  
B. RUGGIERO ◽  
V. CORATO ◽  
E. ESPOSITO ◽  
C. GRANATA ◽  
M. RUSSO ◽  
...  
Keyword(s):  
Josephson Junctions ◽  
Quantum Coherence ◽  
New Method ◽  
Level System ◽  
Macroscopic Quantum ◽  
Quantum Bit ◽  
Classical Quantum ◽  
Macroscopic Quantum Coherence ◽  
Adiabatic Inversion ◽  
Rf Squid

We present our recent experiments on macroscopic tunneling in the quantum regime for underdamped Josephson junctions with different classical-quantum crossover temperatures. These experiments are performed towards the observation of macroscopic quantum coherence in Josephson systems. A new method to measure coherence in a two-level system based on the adiabatic inversion in an rf squid, is presented. This approach could open new perspectives in view of realization of an elementary quantum bit.

Macroscopic Quantum Coherence in an Rf-SQUID

2001 ◽  
pp. 7-16
Author(s):  
Jonathan R. Friedman ◽  
Vijay Patel ◽  
W. Chen ◽  
S. K. Tolpygo ◽  
J. E. Lukens
Keyword(s):  
Quantum Coherence ◽  
Macroscopic Quantum ◽  
Macroscopic Quantum Coherence ◽  
Rf Squid
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