Quantum 5, 511 (2021). https://doi.org/10.22331/q-2021-07-28-511 The causal structure of a unitary transformation is the set of relations of possible influence between any input subsystem and any output subsystem. We study whether such causal structure can […]
Quantum 5, 510 (2021). https://doi.org/10.22331/q-2021-07-27-510 We present a general framework for modifying quantum approximate optimization algorithms (QAOA) to solve constrained network flow problems. By exploiting an analogy between flow-constraints and Gauss’ law for electromagnetism, we […]
Quantum 5, 509 (2021). https://doi.org/10.22331/q-2021-07-26-509 The ability to simulate a fermionic system on a quantum computer is expected to revolutionize chemical engineering, materials design, nuclear physics, to name a few. Thus, optimizing the simulation circuits […]
Quantum 5, 508 (2021). https://doi.org/10.22331/q-2021-07-22-508 In general relativity, the description of spacetime relies on idealised rods and clocks, which identify a reference frame. In any concrete scenario, reference frames are associated to physical systems, which […]
Quantum 5, 507 (2021). https://doi.org/10.22331/q-2021-07-20-507 There has been an intense debate on the question as to whether a quanton, passing through a double-slit, experiences a ‘momentum kick’ due to the act of which-way detection. There […]
Quantum 5, 506 (2021). https://doi.org/10.22331/q-2021-07-19-506 Rutherford scattering is usually described by treating the projectile either classically or as quantum mechanical plane waves. Here we treat them as wave packets and study their head-on collisions with […]
Quantum 5, 505 (2021). https://doi.org/10.22331/q-2021-07-15-505 We study the role of coherence in closed and open quantum batteries. We obtain upper bounds to the work performed or energy exchanged by both closed and open quantum batteries […]
Quantum 5, 504 (2021). https://doi.org/10.22331/q-2021-07-15-504 We introduce $textit{Partially Coherent Direct Sum}$ (PCDS) quantum channels, as a generalization of the already known $textit{Direct Sum}$ quantum channels. We derive necessary and sufficient conditions to identify the subset […]
Quantum 5, 503 (2021). https://doi.org/10.22331/q-2021-07-13-503 We argue that the quantum-theoretical structures studied in several recent lines of research cannot be adequately described within the standard framework of quantum circuits. This is in particular the case […]
Quantum 5, 502 (2021). https://doi.org/10.22331/q-2021-07-13-502 Identifying computational tasks suitable for (future) quantum computers is an active field of research. Here we explore utilizing quantum computers for the purpose of solving differential equations. We consider two […]
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