- Chris Quintana
- Yu Chen
- Daniel Sank
- Andre Petukhov
- Ted White
- Dvir Kafri
- Ben Chiaro
- Anthony Megrant
- Rami Barends
- Brooks Campbell
- Zijun Chen
- Andrew Dunsworth
- Austin Fowler
- Rob Graff
- Evan Jeffrey
- Julian Kelly
- Erik Lucero
- Josh Mutus
- Matthew Neeley
- Charles Neill
- Peter O'Malley
- Pedram Roushan
- Alireza Shabani
- Vadim Smelyanskiy
- Amit Vainsencher
- Jim Wenner
- Hartmut Neven
- John Martinis
Abstract
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 2kBT /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 Hz. The antisymmetric component displays a 1/T dependence below 100 mK, providing dynamical evidence for a paramagnetic environment. Extrapolating the two-sided spectrum predicts the linewidth and reorganization energy of incoherent resonant tunneling between flux qubit wells.
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