Quantum 9, 1672 (2025). https://doi.org/10.22331/q-2025-03-25-1672 Multi-armed bandits are one of the theoretical pillars of reinforcement learning. Recently, the investigation of quantum algorithms for multi-armed bandit problems was started, and it was found that a quadratic […]
Quantum 9, 1671 (2025). https://doi.org/10.22331/q-2025-03-25-1671 Flat bands (FBs) are energy bands with zero group velocity, which in electronic systems were shown to favor strongly correlated phenomena. Indeed, a FB can be spanned with a basis […]
Quantum 9, 1670 (2025). https://doi.org/10.22331/q-2025-03-25-1670 We propose a definition of wavefunction “branchings”: quantum superpositions which can’t be feasibly distinguished from the corresponding mixed state, even under time evolution. Our definition is largely independent of interpretations, […]
Quantum 9, 1669 (2025). https://doi.org/10.22331/q-2025-03-25-1669 Computing vacuum states of lattice gauge theories (LGTs) containing fermionic degrees of freedom can present significant challenges for classical computation using Monte-Carlo methods. Quantum algorithms may offer a pathway towards […]
Quantum 9, 1668 (2025). https://doi.org/10.22331/q-2025-03-25-1668 In quantum many-body systems, complex dynamics delocalize the physical degrees of freedom. This spreading of information throughout the system has been extensively studied in relation to quantum thermalization, scrambling, and […]
Quantum 9, 1667 (2025). https://doi.org/10.22331/q-2025-03-24-1667 We propose an algorithm that combines the inchworm method and the frozen Gaussian approximation to simulate the Caldeira-Leggett model in which a quantum particle is coupled with thermal harmonic baths. […]
Quantum 9, 1666 (2025). https://doi.org/10.22331/q-2025-03-20-1666 Quantum thermodynamics and quantum entanglement represent two pivotal quantum resource theories with significant relevance in quantum information science. Despite their importance, the intricate relationship between these two theories is still […]
Quantum 9, 1665 (2025). https://doi.org/10.22331/q-2025-03-20-1665 Free-fermionic states, also known as matchgates or Gaussian states, are a fundamental class of quantum states due to their efficient classical simulability and their crucial role across various domains of […]
Quantum 9, 1664 (2025). https://doi.org/10.22331/q-2025-03-20-1664 The Bekenstein bound posits a maximum entropy for matter with finite energy confined to a spatial region. It is often interpreted as a fundamental limit on the information that can […]
Quantum 9, 1663 (2025). https://doi.org/10.22331/q-2025-03-20-1663 Current state-of-the-art quantum optimization algorithms require representing the original problem as a binary optimization problem, which is then converted into an equivalent cost Hamiltonian suitable for the quantum device. Implementing […]
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