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• W2079180900 startingPage "4682" @default.
• W2079180900 abstract "Experiments are described that demonstrate the quantum behavior of a macroscopic degree of freedom, namely the phase difference ensuremath{delta} across a current-biased Josephson tunnel junction. The behavior of ensuremath{delta} was deduced from measurements of the escape rate ensuremath{Gamma} of the junction from its zero-voltage state. The relevant parameters of the junction, that is, its critical current and shunting admittance, were determined in situ in the thermal regime from the dependence of ensuremath{Gamma} on bias current and from resonant activation in the presence of microwaves. It was found that the shunting capacitance was dominated by the self-capacitance of the junction while the shunting conductance was dominated by the bias circuitry. For an underdamped junction in the quantum regime, ensuremath{Gamma} became independent of temperature at low temperatures with a value that, with no adjustable parameters, was in excellent agreement with predictions for macroscopic quantum tunneling at T=0. When the critical current was reduced with a magnetic field so that the junction remained in the thermal regime at low temperatures, ensuremath{Gamma} followed the predictions of the thermal model, thereby showing the influence of extraneous noise to be negligible. In a further series of experiments, the existence of quantized energy levels in the potential well of the junction was demonstrated spectroscopically. The positions of the energy levels agreed quantitatively with quantum-mechanical predictions involving junction parameters measured in the thermal regime. The relative heights and widths of the resonances are in reasonable agreement with the predictions of a simple model." @default.
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• W2079180900 date "1987-04-01" @default.
• W2079180900 modified "2023-10-14" @default.
• W2079180900 title "Experimental tests for the quantum behavior of a macroscopic degree of freedom: The phase difference across a Josephson junction" @default.
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• W2079180900 doi "https://doi.org/10.1103/physrevb.35.4682" @default.
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