Kavli Affiliate: Simon Groblacher
| First 5 Authors: Niccolò Fiaschi, Lorenzo Scarpelli, Alexander Rolf Korsch, Amirparsa Zivari, Simon Gröblacher
| Summary:
High-frequency phonons hold great promise as carriers of quantum information
on-chip and as quantum memories. Due to their coherent interaction with several
systems, their compact mode volume and slow group velocity, multiple
experiments have recently demonstrated coherent transport of information
on-chip using phonon modes, interconnecting distinct quantum devices. Strongly
confined phonons in waveguide-like geometries are particularly interesting
because of their long lifetime. However, spectral diffusion has been observed
to substantially limit their coherence times. Coupling to two-level systems is
suspected to be a major contributor to the diffusion, however, to date, the
origin and underlying mechanisms are however still not fully understood. Here,
we perform a time-domain study on two adjacent mechanical modes (separated by
around 5 MHz) and show that the frequency positions of the two modes are not
correlated in time, in agreement with our theoretical model and Monte-Carlo
simulations. This result is an important step in fully understanding the
microscopic mechanisms of dephasing in mechanical quantum buses and memories.
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