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  • 1
    Electronic Resource
    Electronic Resource
    Quantum superposition of distinct macroscopic states (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 406 (2000), S. 43-46 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In 1935, Schrödinger attempted to demonstrate the limitations of quantum mechanics using a thought experiment in which a cat is put in a quantum superposition of alive and dead states. The idea remained an academic curiosity until the 1980s when it was proposed that, under ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35017505
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  • 2
    Electronic Resource
    Electronic Resource
    Superconductor digital frequency divider operating up to 750 GHz (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 2817-2819 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A superconductor frequency divider based on rapid single flux quantum (RSFQ) logic has been demonstrated to operate from dc to 750 GHz with an error rate less than the measurement limit (25 MHz). This high operating frequency is made possible by the use of small (0.25 μm2), high critical current density Josephson junctions along with an optimized design having parameter margins of ±30%. Simulations based on the Werthamer model are in reasonable agreement with the data and give a SFQ pulse width of 1 ps and a maximum power dissipation of 1.5 μW. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122600
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  • 3
    Electronic Resource
    Electronic Resource
    Submillimeter wave generation using Josephson junction arrays (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1805-1807 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Arrays of phase-locked Josephson junctions have been developed and tested which deliver over 1 μW of power, via superconducting microstrip, to loads with resistances ranging from 20 to 60 Ω. The arrays, designed to operate at 350 GHz, typically are continuously tunable from 350 to 450 GHz or higher, the upper limit being set by the onset of loss in the lead alloy microstrip.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101270
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  • 4
    Electronic Resource
    Electronic Resource
    Flux amplification using stochastic superconducting quantum interference devices (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 108-110 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The flux change δ Φ through a bistable superconducting quantum interference device has been measured in the presence of thermally induced switching (with rate Γ) versus δ Φx, the change in the applied flux. For small δ Φx, δ Φ is proportional to δ Φx with a measured flux gain g, depending on the temperature, barrier height, and frequency Ω, with a maximum of about 16. In agreement with theories of periodically driven stochastic bistable systems, g(Ω) is nearly frequency independent up to Γ and is proportional to Ω−1 for Ω(very-much-greater-than)Γ. For larger amplitude signals, harmonic generation has been measured in the adiabatic limit (Ω(very-much-less-than)Γ) and found to be in good agreement with theory. Possible applications of this system for flux measurement are discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114161
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  • 5
    Electronic Resource
    Electronic Resource
    High-speed single-flux-quantum circuit using planarized niobium-trilayer Josephson junction technology (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 646-648 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple test circuit of the rapid single-flux-quantum (RSFQ) logic family has been implemented in a planarized all-refractory technology using only two superconducting layers and small Nb/AlOx/Nb Josephson junctions (nominally 1.5×1.5 μm2) with critical current density jc≈6 kA/cm2. A special layout design of the integrated circuit (including a SFQ pulse generator, Josephson transmission line, and T flip–flop) was used to reduce 3D inductances resulting from absence of the ground plane. For samples with various junction parameters, the maximum frequency of the SFQ pulse train, which could be divided by 2 by the flip–flop, ranged from 200 to 370 GHz. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114147
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  • 6
    Electronic Resource
    Electronic Resource
    Demonstration of Josephson effect submillimeter wave sources with increased power (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 1424-1426 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A submillimeter wave source based on a new design using Josephson junction arrays has been developed and tested. The maximum rf power, delivered to a 68Ω load and detected on chip, was 47 μW at 394 GHz. Significant power was detected at a number of frequencies from 300 to 500 GHz where the power was 10 μW. The observed power at the designed operating frequency near 400 GHz is consistent with all 500 junctions in the series biased array delivering current in phase to the loads. This is in agreement with simulations of smaller arrays of the same design. The linewidth, inferred from the measured resistance at the point of maximum power, with T=4.2 K, is less than 1 MHz. The minimum inferred linewidth near 400 GHz, at somewhat lower power, is about 100 kHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111904
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  • 7
    Electronic Resource
    Electronic Resource
    Millimeter wave phase-locking in distributed Josephson arrays (1987)
    Springer
    International journal of infrared and millimeter waves 8 (1987), S. 1281-1286 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Voltage tunable oscillators operating at millimeter and submillimeter wavelengths can be designed and fabricated using series arrays of Josephson junctions. The coherent radiation obtained from such oscillators results from the mutual phase-locking of the junction through the high-frequency Josephson current generated in the array. A 40-junction array of Josephson junctions distributed over many wavelengths has been designed, fabricated and tested for operation at 100 GHz. This paper presents the experimental results obtained for this prototype array. A review of the theory for optimizing array design is presented along the implications for power generation at submillimeter wavelengths in future arrays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01011079
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  • 8
    Electronic Resource
    Electronic Resource
    Observation of Coherent Charge-State Mixing in Asymmetric Bloch Transistors (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 813-817 
    Details
    ISSN: 1572-9605
    Keywords: Bloch transistor ; Cooper-pair tunneling ; quantum coherence ; single-electron tunneling (SET)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The reduced switching current of an excited energy band in a Bloch transistor can be used to detect microwave-induced interband transitions. Spectroscopic measurements of the band gap are performed by mapping the frequency dependence of the excitation threshold where the microwave photon energy and band gap are equal. This excitation threshold also provides a probe of charge-state mixing on the island of the transistor. Any asymmetry in the junctions of the transistor makes the coherent mixing of charge states appear as a finite gap splitting at the electrostatic degeneracy point between states differing by one excess Cooper pair on the island. The measured gap splitting in an asymmetric transistor clearly demonstrates the effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007797329201
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