By A. J. Leggett (auth.), Dmitri V. Averin, Berardo Ruggiero, Paolo Silvestrini (eds.)
This quantity is an outgrowth of the second one overseas Workshop on Macroscopic Quantum Coherence and Computing held in Napoli, Italy, in June 2000. This workshop collected a few specialists from the key Universities and learn associations of numerous international locations. the alternative of the positioning, which acknowledges the position and the traditions of Naples during this box, assured the individuals a stimulating surroundings. the purpose of the workshop has been to document at the contemporary theoretical and experimental effects at the macroscopic quantum coherence of macroscopic platforms. specific consciousness was once dedicated to Josephson units. The correlation with different atomic and molecular platforms, displaying a macroscopic quantum behaviour, used to be additionally mentioned. The seminars supplied either historic assessment and up to date theoretical floor at the subject, in addition to info on new experimental effects relative to the quantum computing region. the 1st workshop in this subject, held in Napoli in 1998, has been ennobled by means of very important studies on observations of Macroscopic Quantum Coherence in mesoscopic platforms. the present workshop proposed, between many stimulating effects, the 1st observations of Macroscopic Quantum Coherence among macroscopically distinctive fluxoid states in rf SQUIDs, two decades after the Leggett's idea to experimentally try out the quantum habit of macroscopic structures. reviews on observations of quantum behaviour in molecular and magnetic platforms, small Josephson units, quantum dots have additionally been really stimulating in view of the belief of numerous attainable q-bits.
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Extra info for Macroscopic Quantum Coherence and Quantum Computing
Josephson junction loop. Even though the measuring DC-SQUID is contributing significantly to the decoherence of our system (see also Ref. ), it was possible to detect the superposition states since the SQUID was only weakly coupled to the loop. The present results demonstrate the potential of three-junction persistent-current loops for research on macroscopic quantum coherence and quantum computation. Acknowledgments We thank J. B. Majer, A. C. Wallast, L. Tian, D. S. Crankshaw, J. Schmidt, A.
When td is longest, the eurve is almost equivalent to that of a single-pulse experiment with Tr = 32 ns, where after each pulse the quantum state relaxes to the ground state almost completely before the next pulse arrives. The peak positions indicated by the dotted lines correspond to Qo where the single-pulse operation works nearly like a 7r-pulse that flips the ground state to the upper state which results in the current maximum. On the other hand, in the medium range of td, a dip, instead of a peak, is observed at those Qo values.
The critical current of a junction is leo = ~ E J , where 'Ii, = 2~ is Planck's reduced constant. 8. At an applied flux ~ext close to ~~o the total Josephson energy forms a double well potential. The classical states at the bottom of each well have persistent currents of opposite sign, with a magnitude lp very close to leo of the weakest junction, and with energies E = ±lp(~ext - ~~o) (dashed lines in Fig. 1c). We assume here ~ext to be the total flux in the loop (the small self-generated flux due to the persistent currents leads to a constant lowering of the energies, but the crossing remains at ~~o).
Macroscopic Quantum Coherence and Quantum Computing by A. J. Leggett (auth.), Dmitri V. Averin, Berardo Ruggiero, Paolo Silvestrini (eds.)