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Generalized squeezing as a witness
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Quantum systems can be prepared in an infinite continuum of states, but only some of them can be used as resources for quantum technologies. Discerning whether a specific quantum state falls into this class, is often a challenging task. We show that it can be performed by looking at the squeezing of the quantum states - a scenario in which the variance of some observable operator is suppressed below the threshold given by the non-useful states. We discuss the general concept first; then we illustrate the approach by evaluating cubic nonlinear squeezing in the system of collective atomic spins.
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Efficient characterization of general Gottesman-Kitaev-Preskill qubits
A new set of positive semidefinite operators for GKP qubits gives logical infidelity via three quadrature measurements and yields finite-dimensional approximations as ground states.
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