title: Landau-Zener-Stückelberg Interferometry in Quantum Dots with Fast Rise Times: Evidence for Coherent Phonon Driving.
abstract: Manipulating qubits via electrical pulses in a piezoelectric material such as GaAs can be expected to generate incidental acoustic phonons. In this Letter we determine theoretically and experimentally the consequences of these phonons for semiconductor spin qubits using Landau-Zener-Stückelberg interferometry. Theoretical calculations predict that phonons in the presence of the spin-orbit interaction produce both phonon-Rabi fringes and accelerated evolution at the singlet-triplet anticrossing. Observed features confirm the influence of these mechanisms. Additionally, evidence is found that the pulsed gates themselves act as phonon cavities increasing the influence of phonons under specific resonant conditions.
authors.affiliation: Security and Disruptive Technologies, National Research Council Canada, Ottawa, K1A 0R6, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Korkusinski
authors.affiliation: Security and Disruptive Technologies, National Research Council Canada, Ottawa, K1A 0R6, Canada.
authors.forename: S A
authors.initials: SA
authors.lastname: Studenikin
authors.affiliation: Security and Disruptive Technologies, National Research Council Canada, Ottawa, K1A 0R6, Canada.
authors.forename: G
authors.initials: G
authors.lastname: Aers
authors.affiliation: Security and Disruptive Technologies, National Research Council Canada, Ottawa, K1A 0R6, Canada.
authors.forename: G
authors.initials: G
authors.lastname: Granger
authors.affiliation: Security and Disruptive Technologies, National Research Council Canada, Ottawa, K1A 0R6, Canada.
authors.forename: A
authors.initials: A
authors.lastname: Kam
authors.affiliation: Security and Disruptive Technologies, National Research Council Canada, Ottawa, K1A 0R6, Canada.
authors.forename: A S
authors.initials: AS
authors.lastname: Sachrajda