Microscopic model of electric-field-noise heating in ion traps

摘要: Motional heating of ions in microfabricated traps is one the open challenges hindering experimental realizations large-scale quantum processing devices. Recently, a series measurements rates surface-electrode ion characterized their frequency, distance, and temperature dependencies, but our understanding microscopic origin this noise remains incomplete. In work we develop theoretical model for electric field which associated with random distribution adsorbed atoms on trap electrode surface. By using first-principles calculations fluctuating dipole moments evaluate dependence resulting fluctuation spectrum. Our theory reproduces correctly d{sup -4} distance from surface calculates spectrum beyond standard scenario two-level fluctuators by incorporating all relevant vibrational states. predicts regime 1/f commences at roughly frequency fundamental phonon transition rate thermally activated higher temperatures exhibits crossover as function frequency.