Quantum 9, 1688 (2025). https://doi.org/10.22331/q-2025-04-03-1688 Complexity theory typically focuses on the difficulty of solving computational problems using classical inputs and outputs, even with a quantum computer. In the quantum world, it is natural to apply […]
Quantum 9, 1687 (2025). https://doi.org/10.22331/q-2025-04-03-1687 This paper introduces quantum edge detection, aimed at locating boundaries of quantum domains where all particles share the same pure state. Focusing on the 1D scenario of a string of […]
Quantum 9, 1686 (2025). https://doi.org/10.22331/q-2025-04-03-1686 What is fundamentally quantum? We argue that most of the features, problems, and paradoxes – such as the measurement problem, the Wigner’s friend paradox and its proposed solutions, single particle […]
Quantum 9, 1685 (2025). https://doi.org/10.22331/q-2025-04-03-1685 We study free fermion systems under adaptive quantum dynamics consisting of unitary gates and projective measurements followed by corrective unitary operations. We further introduce a classical flag for each site, […]
Quantum 9, 1684 (2025). https://doi.org/10.22331/q-2025-04-03-1684 The fidelity of quantum operations is often limited by incoherent errors, which typically can be modeled by fundamental Markovian noise processes such as amplitude damping and dephasing. In Phys. Rev. […]
Quantum 9, 1683 (2025). https://doi.org/10.22331/q-2025-04-01-1683 In the presence of ring exchange interactions, bosons in a ladder-like lattice may form the bosonic analogon of a correlated metal, known as the d-wave Bose liquid (DBL). In this […]
Quantum 9, 1682 (2025). https://doi.org/10.22331/q-2025-04-01-1682 We investigate the feasibility of early fault-tolerant quantum algorithms focusing on ground-state energy estimation problems. In particular, we examine the computation of the cumulative distribution function (CDF) of the spectral […]
Quantum 9, 1681 (2025). https://doi.org/10.22331/q-2025-04-01-1681 We investigate operator dynamics and entanglement growth in dual-unitary circuits, a class of locally scrambled quantum systems that enables efficient simulation beyond the exponential complexity of the Hilbert space. By […]
Quantum 9, 1680 (2025). https://doi.org/10.22331/q-2025-03-27-1680 Quantum reference frames are needed in quantum theory for much the same reasons that reference frames are in classical theories: to manifest invariance in line with fundamental relativity principles and […]
Quantum 9, 1679 (2025). https://doi.org/10.22331/q-2025-03-27-1679 There is a large body of work studying what forms of computational hardness are needed to realize classical cryptography. In particular, one-way functions and pseudorandom generators can be built from […]
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