## Macroscopic Quantum Coherence and Quantum ComputingDmitri V. Averin, Berardo Ruggiero, Paolo Silvestrini This volume is an outgrowth of the Second International Workshop on Macroscopic Quantum Coherence and Computing held in Napoli, Italy, in June 2000. This workshop gathered a number of experts from the major Universities and Research Institutions of several countries. The choice of the location, which recognizes the role and the traditions of Naples in this field, guaranteed the participants a stimulating atmosphere. The aim of the workshop has been to report on the recent theoretical and experimental results on the macroscopic quantum coherence of macroscopic systems. Particular attention was devoted to Josephson devices. The correlation with other atomic and molecular systems, exhibiting a macroscopic quantum behaviour, was also discussed. The seminars provided both historical overview and recent theoretical ground on the topic, as well as information on new experimental results relative to the quantum computing area. The first workshop on this topic, held in Napoli in 1998, has been ennobled by important reports on observations of Macroscopic Quantum Coherence in mesoscopic systems. The current workshop proposed, among many stimulating results, the first observations of Macroscopic Quantum Coherence between macroscopically distinct fluxoid states in rf SQUIDs, 20 years after the Leggett's proposal to experimentally test the quantum behavior of macroscopic systems. Reports on observations of quantum behaviour in molecular and magnetic systems, small Josephson devices, quantum dots have also been particularly stimulating in view of the realization of several possible q-bits. |

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### Contents

1 | |

7 | |

QuantumState Interference in a CooperPair Box | 17 |

Macroscopic Quantum Superposition in a ThreeJosephsonJunction | 25 |

Fate of | 35 |

Macroscopic Quantum Phenomena in Atomic BoseEinstein | 41 |

PhaseCoherent Electronic Transport in a MultiWall Carbon | 51 |

Macroscopic Quantum Phenomena in Underdamped Josephson | 61 |

Interaction of Vortices with Non | 245 |

Theory Practice and Future Prospects | 253 |

An Analysis of the Quantum | 261 |

Adiabatic Inversion in the SQUID Macroscopic Coherence | 271 |

Quantum Computing with Separable States? | 285 |

Spintronics and Quantum Computing with Quantum Dots | 293 |

Transport through Artificial Kondo Impurities | 316 |

Compensation of the Spin of a Quantum Dot at Coulomb Blockade | 325 |

Superconducting Devices to Test Macroscopic Quantum | 73 |

In Situ | 101 |

Superconducting Electrometer for Measuring the Single Cooper | 111 |

Adiabatic Transport of Cooper Pairs in Arrays of Small Josephson | 127 |

Entangled States in a Josephson Charge Qubit Coupled to | 137 |

Nonlocality in Superconducting Microstructures | 155 |

Characterisation of Cooper Pair Boxes for Quantum Bits | 165 |

Noise Measurements of a Superconducting Single Electron | 173 |

Quantum Coherence and Decoherence in Magnetic Nanostructures | 183 |

MQT of Magnetic Particles | 195 |

Abrupt Transition between ThermallyAssisted and Pure | 207 |

Quantum Effects in the Dynamics of the Magnetization in Single | 215 |

Quantum Coherence and Very Low Temperature Magnetic | 225 |

Quantum Gates and Networks with Cavity QED Systems | 235 |

MultiParticle Entanglement in Quantum Computers | 341 |

A Unified Dynamical | 351 |

1F Noise during Manipulation of Josephson Charge Qubits | 359 |

NonMarkovian Dynamics in ContinuousWave Atom Lasers | 367 |

TimeCorrelated Macroscopic Quantum Tunneling of Solitons | 381 |

The NonPerturbative Quantum Behaviour of a SQUID Ring in | 389 |

Noise Properties of the SET Transistor in the CoTunneling | 399 |

Charge Fluctuations and Dephasing in Coulomb Coupled | 409 |

The Measurement of Photon Number States Using Cavity QED | 419 |

Abrupt Magnetoresistance Jumps in NiWire Systems | 427 |

Spontaneous Generation of Flux in a Josephson Junction Loop | 443 |

Soliton Quantum Bit | 449 |

459 | |

### Other editions - View all

Macroscopic Quantum Coherence and Quantum Computing Dmitri V. Averin,Berardo Ruggiero,Paolo Silvestrini No preview available - 2012 |

Macroscopic Quantum Coherence and Quantum Computing Dmitri V. Averin,Berardo Ruggiero,Paolo Silvestrini No preview available - 2001 |

### Common terms and phrases

2DEG adiabatic anisotropy applied array atom laser Averin barrier bias biepitaxial Bose–Einstein condensate calculated capacitance cavity charging energy circuit classical co-tunneling Cooper pair Cooper pair box Cooper-pair box correlation corresponding Coulomb blockade coupling critical current curves decoherence degrees of freedom density operator dependence described devices Devoret dissipation dynamics effect electromagnetic energy levels entanglement environment equation experiment experimental external Figure fluctuations flux frequency gate voltage Hamiltonian inset interaction ions Josephson junctions Kondo Kondo effect Leggett Lett loop macroscopic quantum magnetic field magnetisation measured mesoscopic microwave mode MWNT noise nonlocal observed oscillations parameters particle photon Phys Physics potential pulse pumping quantum coherence quantum computing quantum dots quantum mechanical quantum tunneling qubit regime relaxation resistance resonance rſ-SQUID sample shows singlet soliton spin SQUID SQUID ring SSET superconducting superposition switching symmetric thermal transistor transition trap values zero