Speaker
Joydip Ghosh
(University of Calgary)
Description
Quantum walk (QW) on a disordered lattice leads to a multitude of
interesting phenomena, such as Anderson localization. While QW has been
realized in various optical and atomic systems, its implementation with
superconducting qubits still remains pending. The major challenge in
simulating QW with superconducting qubits emerges from the fact that
on-chip superconducting qubits cannot hop between two adjacent lattice
sites. In this talk, I discuss how to overcome this barrier and develop a
gate-based scheme to realize the discrete time QW by placing a pair of
qubits on each site of a 1D lattice and treating an excitation as a walker.
It is also shown that various lattice disorders can be introduced and fully
controlled by tuning the qubit parameters in our quantum walk circuit. We
observe a distinct signature of transition from the ballistic regime to a
localized QW with an increasing strength of disorder. Finally, an
eight-qubit experiment is proposed where the signatures of such localized
and delocalized regimes can be detected with existing
superconducting technology.
Primary author
Joydip Ghosh
(University of Calgary)
