Quantum 7, 1025 (2023). https://doi.org/10.22331/q-2023-05-31-1025 Coherent states of the quantum electromagnetic field, the quantum description of ideal laser light, are prime candidates as information carriers for optical communications. A large body of literature exists on […]
Quantum 7, 1024 (2023). https://doi.org/10.22331/q-2023-05-31-1024 The precise determination of a displacement of a mechanical oscillator or a microwave field in a predetermined direction in phase space can be carried out with trapped ions or superconducting […]
Quantum 7, 1023 (2023). https://doi.org/10.22331/q-2023-05-31-1023 Quantum Neural Networks (QNN) are considered a candidate for achieving quantum advantage in the Noisy Intermediate Scale Quantum computer (NISQ) era. Several QNN architectures have been proposed and successfully tested […]
Quantum 7, 1022 (2023). https://doi.org/10.22331/q-2023-05-24-1022 Equilibrium quantum many-body systems in the vicinity of phase transitions generically manifest universality. In contrast, limited knowledge has been gained on possible universal characteristics in the non-equilibrium evolution of systems […]
Quantum 7, 1021 (2023). https://doi.org/10.22331/q-2023-05-24-1021 We explore the role of majorization theory in quantum phase space. To this purpose, we restrict ourselves to quantum states with positive Wigner functions and show that the continuous version […]
Quantum 7, 1020 (2023). https://doi.org/10.22331/q-2023-05-24-1020 Exact solutions in interacting many-body systems are scarce but extremely valuable since they provide insights into the dynamics. Dual-unitary models are examples in one spatial dimension where this is possible. […]
Quantum 7, 1019 (2023). https://doi.org/10.22331/q-2023-05-24-1019 Computing the key rate in quantum key distribution (QKD) protocols is a long standing challenge. Analytical methods are limited to a handful of protocols with highly symmetric measurement bases. Numerical […]
Quantum 7, 1018 (2023). https://doi.org/10.22331/q-2023-05-23-1018 We present an algorithm that uses block encoding on a quantum computer to exactly construct a Krylov space, which can be used as the basis for the Lanczos method to […]
Quantum 7, 1017 (2023). https://doi.org/10.22331/q-2023-05-23-1017 Bosonic Gaussian states are a special class of quantum states in an infinite dimensional Hilbert space that are relevant to universal continuous-variable quantum computation as well as to near-term quantum […]
Quantum 7, 1016 (2023). https://doi.org/10.22331/q-2023-05-23-1016 We study the phenomena of topological amplification in arrays of parametric oscillators. We find two phases of topological amplification, both with directional transport and exponential gain with the number of […]
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