Operator noncommutation, a hallmark of quantum theory, limits measurement precision,
according to uncertainty principles. Wielded correctly, though, noncommutation can boost …

Quasiprobabilities are mathematical quantities describing the statistics of measurement
outcomes evaluated at two or more times, which incorporate the incompatibility of the …

Coherent tripartite interactions among degrees of freedom of completely different nature are
instrumental for quantum information and simulation technologies, but they are generally …

In every parameter-estimation experiment, the final measurement or the postprocessing
incurs a cost. Postselection can improve the rate of Fisher information (the average …

Kirkwood-Dirac (KD) quasiprobability is a quantum analog of phase space probability of
classical statistical mechanics, allowing negative or/and nonreal values. It gives an …

The most famous quasi-probability distribution, the Wigner function, has played a pivotal role
in the development of a continuous-variable quantum theory that has clear analogues of …

Two topics, evolving rapidly in separate fields, were combined recently: the out-of-time-
ordered correlator (OTOC) signals quantum-information scrambling in many-body systems …

PT-symmetric theory is developed to extend quantum mechanics to a complex region, but it
wins its great success first in classical systems, for example, optical waveguides and electric …

For quantum systems with a finite dimensional Hilbert space of states, we show that the
complete incompatibility of two observables—a notion we introduce—is equivalent to the …

Recent work has revealed the central role played by the Kirkwood-Dirac quasiprobability
(KDQ) as a tool to properly account for non-classical features in the context of condensed …