Towards an experiment of MQC: determination of the decoherence time from energy level quantization in rf SQUIDs

被引：1

作者：

Cosmelli, C

Carelli, P

Castellano, MG

Chiarello, F

Leoni, R

Torrioli, G

机构：

来源：

QUANTUM COHERENCE AND DECOHERENCE | 1999年

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D O I：

10.1016/B978-044450091-5/50053-1

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In view of realizing an experiment of Macroscopic Quantum Coherence with SQUIDs we have measured the effective resistance of a SQUID cooled at a temperature of 35mK. From a fit of the data with a simplified solution of the master equation describing the system dynamics we found an effective resistance R approximate to 4 Mn. This value, in the same system cooled at 4 mK, should lead to a decoherence time of approximately 1.4 mu s allowing to perform MQC measurements with a tunneling frequency of the order of few MHz.

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页码：245 / 248

页数：4

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共 20 条

[1]

BARONE, 1982, PHYSICS APPL JOSEPHS

[2] Prospects for quantum coherent computation using superconducting electronics [J].

Bocko, MF ;

Herr, AM ;

Feldman, MJ .

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 1997, 7 (02) :3638-3641

[3] THERMAL-ACTIVATION IN THE QUANTUM REGIME AND MACROSCOPIC TUNNELLING IN THE THERMAL REGIME IN A METABISTABLE SYSTEM CONSISTING OF A SUPERCONDUCTING RING INTERRUPTED BY A WEAK JUNCTION .3. MACROSCOPIC QUANTUM TUNNELLING IN THE THERMAL REGIME [J].

BOL, DW ;

OUBOTER, RD .

PHYSICA B-CONDENSED MATTER, 1989, 160 (01) :56-82

[4] INFLUENCE OF DISSIPATION ON QUANTUM TUNNELING IN MACROSCOPIC SYSTEMS [J].

CALDEIRA, AO ;

LEGGETT, AJ .

PHYSICAL REVIEW LETTERS, 1981, 46 (04) :211-214

[5] QUANTUM TUNNELLING IN A DISSIPATIVE SYSTEM [J].

CALDEIRA, AO ;

LEGGETT, AJ .

ANNALS OF PHYSICS, 1983, 149 (02) :374-456

[6] Switching dynamics of Nb/AlOx/Nb Josephson junctions: Measurements for an experiment of macroscopic quantum coherence [J].

Castellano, MG ;

Leoni, R ;

Torrioli, G ;

Chiarello, F ;

Cosmelli, C ;

Costantini, A ;

DiambriniPalazzi, G ;

Carelli, P ;

Cristiano, R ;

Frunzio, L .

JOURNAL OF APPLIED PHYSICS, 1996, 80 (05) :2922-2928

[7]

COSMELLI C, 1997, IN PRESS P INT C MAC

[8] Can quantum-mechanical description of physical reality be considered complete? [J].

Einstein, A ;

Podolsky, B ;

Rosen, N .

PHYSICAL REVIEW, 1935, 47 (10) :0777-0780

[9] LIFETIME OF ZERO-VOLTAGE STATE IN JOSEPHSON TUNNEL-JUNCTIONS [J].

FULTON, TA ;

DUNKLEBERGER, LN .

PHYSICAL REVIEW B, 1974, 9 (11) :4760-4768

[10] CRITERION FOR THE OBSERVABILITY OF MACROSCOPIC QUANTUM COHERENCE [J].

GARG, A .

PHYSICAL REVIEW B, 1985, 32 (07) :4746-4749