Supplemental Material for “Observation of classical-quantum crossover of 1/f flux noise and its paramagnetic temperature dependence”
نویسندگان
چکیده
C. M. Quintana, Yu Chen, D. Sank, A. G. Petukhov, T. C. White, Dvir Kafri, B. Chiaro, A. Megrant, R. Barends, B. Campbell, Z. Chen, A. Dunsworth, A. G. Fowler, R. Graff, E. Jeffrey, J. Kelly, E. Lucero, J. Y. Mutus, M. Neeley, C. Neill, P. J. J. O’Malley, P. Roushan, A. Shabani, V. N. Smelyanskiy, A. Vainsencher, J. Wenner, H. Neven, and John M. Martinis 2 Department of Physics, University of California, Santa Barbara, California 93106, USA Google Inc., Santa Barbara, California 93117, USA NASA Ames Research Center, Moffett Field, California 94035, USA Google Inc., Venice, CA 90291, USA (Dated: December 6, 2016)
منابع مشابه
Observation of Classical-Quantum Crossover of 1/f Flux Noise and Its Paramagnetic Temperature Dependence.
By analyzing the dissipative dynamics of a tunable gap flux qubit, we extract both sides of its two-sided environmental flux noise spectral density over a range of frequencies around 2k_{B}T/h≈1 GHz, allowing for the observation of a classical-quantum crossover. Below the crossover point, the symmetric noise component follows a 1/f power law that matches the magnitude of the 1/f noise near 1 H...
متن کاملEffects of the sintering temperature on the flux-pinning mechanism and the activation energy of malic-acid doped MgB2
The flux-pinning mechanism and activation energy of 10 wt % malic acid-doped MgB2 were investigated by measuring of the critical current density and resistivity as a function of magnetic field and temperature. A crossover field, Bsb, was observed from the single vortex to the small vortex bundle pinning regime. For the sintered sample, the temperature dependence of Bsb(T) at low temperature i...
متن کاملReal-time non-equilibrium dynamics of quantum glassy systems
We develop a systematic analytic approach to aging effects in quantum disordered systems in contact with an environment. Within the closed-time path-integral formalism we include dissipation by coupling the system to a set of independent harmonic oscillators that mimic a quantum thermal bath. After integrating over the bath variables and averaging over disorder we obtain an effective action tha...
متن کاملOrigin of l / f noise peaks of YBa 2 Cu 30 x films in a magnetic field
The temperature and magnetic field dependence of llfnoise has been measured in epitaxial YBa2Cu30, films. In a magnetic field, two noise pealcs were observed as temperature decreases; one at higher temperature was found to match the thermal fluctuation of the sample resistance and the other near the foot of the transition was found to be magnetic-field dependent. The location of the latter was ...
متن کاملMagnetic flux noise in dc SQUIDs: temperature and geometry dependence.
The spectral density S(Φ)(f) = A(2)/(f/1 Hz)(α) of magnetic flux noise in ten dc superconducting quantum interference devices (SQUIDs) with systematically varied geometries shows that α increases as the temperature is lowered; in so doing, each spectrum pivots about a nearly constant frequency. The mean-square flux noise, inferred by integrating the power spectra, grows rapidly with temperature...
متن کامل