3,894 research outputs found
Enhancing the robustness of dynamical decoupling sequences with correlated random phases
We show that the addition of correlated phases to the recently developed
method of randomized dynamical decoupling pulse sequences [Physical Review
Letters 122, 200403 (2019)] can improve its performance in quantum sensing. In
particular, by correlating the relative phases of basic pulse units in
dynamical decoupling sequences, we are able to improve the suppression of the
signal distortion due to pulse imperfections and spurious responses due
to finite-width pulses. This enhances selectivity of quantum sensors such
as those based on NV centers in diamond
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Connecting nth order generalised quantum Rabi models: Emergence of nonlinear spin-boson coupling via spin rotations
We establish an approximate equivalence between a generalised quantum Rabi
model and its nth order counterparts where spin-boson interactions are
nonlinear as they comprise a simultaneous exchange of bosonic excitations.
Although there exists no unitary transformation between these models, we
demonstrate their equivalence to a good approximation in a wide range of
parameters. This shows that nonlinear spin-boson couplings, i.e. nth order
quantum Rabi models, are accessible to quantum systems with only linear
coupling between boson and spin modes by simply adding spin rotations and after
an appropriate transformation. Furthermore, our result prompts novel
approximate analytical solutions to the dynamics of the quantum Rabi model in
the ultrastrong coupling regime improving previous approaches.Comment: 9 pages, 3 figures plus Supplemental Informatio
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