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Asymmetric 2-Josephson-junction interferometer as a logic gate

Asymmetric 2-Josephson-junction interferometer as a logic gate

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© The Institution of Electrical Engineers
Published

For an interferometer with two unequal Josephson point junctions, the maximum Josephson current, as well as the corresponding control current, is given in closed form as a function of one junction phase. In contrast to 3-Josephson-junction interferometers, with maximum Josephson currents I01=I02/2=I03, 2-junction interferometers, with maximum Josephson currents I01=5I02, can have larger current gain, slope and less device area.

Inspec keywords: logic gates; superconducting junction devices

Other keywords: asymmetric 2-Josephson junction interferometer; logic gate

Subjects: Superconducting junction devices; Other logic elements

References

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      • Guéret, P., Mohr, TH.O., Wolf, P.: `Single flux-quantum memory cells', Applied superconductivity conference, 1976, Palo Alto, Calif..
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      • Landmann, B.S.: `Calculation of threshold curves for Josephson quantum interference', Applied superconductivity conference, 1976, Palo Alto, Calif..
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      • D.E. McCumber . Effect of ac impedance on dc voltage-current characteristics of superconductor weak-link junctions. J. Appl Phys. , 3113 - 3118
    4. 4)
      • Tsang , Won-Tien , T. van Duzer . DC analysis of parallel arrays of two and three Josephson junctions. J. Appl. Phys. , 4573 - 4580
    5. 5)
      • Schulz-Dubois, E.O., Wolf, P.: `Static characteristics of Josephson interferometers', International conference on superconducting quantum devices, 1976, Berlin.
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      • H.H. Zappe . Quantum interference Josephson logic devices. Appl. Phys. Lett. , 432 - 434
    7. 7)
      • W. Jutzi , Th.O. Mohr , M. Gasser , H.P. Gschwind . Josephson junctions with 1 μm dimensions and with picosecond switching times. Electron. Lett. , 589 - 591
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