Abstract
We construct efficient deterministic dynamical decoupling schemes protecting continuous-variable degrees of freedom. Our schemes target decoherence induced by quadratic system-bath interactions with analytic time dependence. We show how to suppress such interactions to th order using only pulses. Furthermore, we show how to homogenize a -mode bosonic system using only pulses, yielding—up to the th order—an effective evolution described by noninteracting harmonic oscillators with identical frequencies. The decoupled and homogenized system provides natural decoherence-free subspaces for encoding quantum information. Our schemes only require pulses which are tensor products of single-mode passive Gaussian unitaries and swap gates between pairs of modes.
- Received 7 December 2018
DOI:https://doi.org/10.1103/PhysRevLett.123.010501
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