Quantum 10, 2047 (2026). https://doi.org/10.22331/q-2026-03-27-2047 In quantum mechanics, the Schrieffer–Wolff (SW) transformation (also called quasi-degenerate perturbation theory) is known as an approximative method to reduce the dimension of the Hamiltonian. We present a geometric interpretation […]
Quantum 10, 2046 (2026). https://doi.org/10.22331/q-2026-03-24-2046 Locality is a central notion in modern physics, but different disciplines understand it in different ways. Quantum field theory focuses on relativistic locality, based on spacetime regions, while quantum information […]
Quantum 10, 2045 (2026). https://doi.org/10.22331/q-2026-03-24-2045 We present a method to suppress crosstalk from implementing controlled-Z gates via local addressing in neutral atom quantum computers. In these systems, a fraction of the laser light that is […]
Quantum 10, 2044 (2026). https://doi.org/10.22331/q-2026-03-24-2044 Security analyses in quantum key distribution (QKD) and other adversarial quantum tasks often assume perfect device models. However, real-world implementations often deviate from these models. Thus, it is important to […]
Quantum 10, 2043 (2026). https://doi.org/10.22331/q-2026-03-24-2043 The Chantasri-Dressel-Jordan (CDJ) stochastic path integral formalism (Chantasri et al. 2013 and 2015) characterizes the statistics of the readouts and the most likely conditional evolution of continuously monitored quantum systems […]
Quantum 10, 2042 (2026). https://doi.org/10.22331/q-2026-03-24-2042 Current proposals to probe the quantum nature of gravity in the low-energy regime predominantly focus on the Newtonian interaction term. In this work, we present a theoretical exploration of gravitationally […]
Quantum 10, 2041 (2026). https://doi.org/10.22331/q-2026-03-23-2041 Quantum algorithms for linear systems produce the solution state $A^{-1}|brangle$ by querying two oracles: $O_A$ that block encodes the coefficient matrix and $O_b$ that prepares the initial state. We present […]
Quantum 10, 2040 (2026). https://doi.org/10.22331/q-2026-03-23-2040 While commonly used entanglement criteria for continuous variable systems are based on quadrature measurements, here we study entanglement detection from measurements of the Wigner function. These are routinely performed in […]
Quantum 10, 2039 (2026). https://doi.org/10.22331/q-2026-03-23-2039 Given an algorithm that outputs the correct answer with bounded error, say $1/3$, it is sometimes desirable to reduce this error to some arbitrarily small $varepsilon$ – e.g., if one […]
Quantum 10, 2038 (2026). https://doi.org/10.22331/q-2026-03-23-2038 Quantum walks in general graphs, or more specifically scattering on graphs, encompass enough complexity to perform universal quantum computation. Any given quantum circuit can be broken down into single- and […]
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