Quantum 9, 1815 (2025). https://doi.org/10.22331/q-2025-07-29-1815 In the paradigmatic example of quantum measurements, whenever one measures a system which starts in a superposition of two states of a conserved quantity, it jumps to one of the […]
Tag: quantumjournal
Quantum 9, 1814 (2025). https://doi.org/10.22331/q-2025-07-29-1814 We consider finite-dimensional many-body quantum systems described by time-independent Hamiltonians and Markovian master equations, and present a systematic method for constructing smaller-dimensional, reduced models that $exactly$ reproduce the time evolution […]
Quantum 9, 1813 (2025). https://doi.org/10.22331/q-2025-07-29-1813 Arunachalam and de Wolf (2018) [1] showed that the sample complexity of quantum batch learning of boolean functions, in the realizable and agnostic settings, has the $textit{same form and order}$ […]
Quantum 9, 1812 (2025). https://doi.org/10.22331/q-2025-07-23-1812 Accurately estimating the properties of quantum systems is a central challenge in quantum computing and quantum information. We propose a method to obtain unbiased estimators of multiple observables with low […]
Quantum 9, 1811 (2025). https://doi.org/10.22331/q-2025-07-23-1811 We derive a class of cellular automata for the Schrödinger Hamiltonian, including scalar and vector potentials. It is based on a multi-split of the Hamiltonian, resulting in a multi-step unitary […]
Quantum 9, 1810 (2025). https://doi.org/10.22331/q-2025-07-23-1810 Bosonic codes encode quantum information into a single infinite-dimensional physical system endowed with error correction capabilities. This reduces the need for complex management of many physical constituents compared with standard […]
Quantum 9, 1809 (2025). https://doi.org/10.22331/q-2025-07-23-1809 We provide a graphical method to describe and analyze non-Gaussian quantum states using a hypergraph framework. These states are pivotal resources for quantum computing, communication, and metrology, but their characterization […]
Quantum 9, 1808 (2025). https://doi.org/10.22331/q-2025-07-22-1808 Discrete models of holographic dualities, typically modeled by tensor networks on hyperbolic tilings, produce quantum states with a characteristic quasiperiodic disorder not present in continuum holography. In this work, we […]
Quantum 9, 1807 (2025). https://doi.org/10.22331/q-2025-07-22-1807 Certifying quantum properties from the probability distributions they induce is an important task for several purposes. While this framework has been largely explored and used for quantum states, its extrapolation […]
Quantum 9, 1806 (2025). https://doi.org/10.22331/q-2025-07-22-1806 Quantum state estimation is a fundamental task in quantum information theory, where one estimates real parameters continuously embedded in a family of quantum states. In the theory of quantum state […]
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