Quantum 6, 808 (2022). https://doi.org/10.22331/q-2022-09-19-808 In this work, we study temperature sensing with finite-sized strongly correlated systems exhibiting quantum phase transitions. We use the quantum Fisher information (QFI) approach to quantify the sensitivity in the […]
Quantum 6, 807 (2022). https://doi.org/10.22331/q-2022-09-19-807 A proof of quantumness is a type of challenge-response protocol in which a classical verifier can efficiently certify the $textit{quantum advantage}$ of an untrusted prover. That is, a quantum prover […]
Quantum 6, 806 (2022). https://doi.org/10.22331/q-2022-09-19-806 Quantum simulation, the simulation of quantum processes on quantum computers, suggests a path forward for the efficient simulation of problems in condensed-matter physics, quantum chemistry, and materials science. While the […]
Quantum 6, 805 (2022). https://doi.org/10.22331/q-2022-09-15-805 We analyze the topological and dynamical properties of a system formed by two chains of identical emitters coupled to a waveguide, whose guided modes induce all-to-all excitation hopping. We find […]
Quantum 6, 804 (2022). https://doi.org/10.22331/q-2022-09-15-804 Very little is known about the cost landscape for parametrized Quantum Circuits (PQCs). Nevertheless, PQCs are employed in Quantum Neural Networks and Variational Quantum Algorithms, which may allow for near-term […]
Quantum 6, 803 (2022). https://doi.org/10.22331/q-2022-09-15-803 This paper builds on the idea of simulating stabiliser circuits through transformations of {quadratic form expansions}. This is a representation of a quantum state which specifies a formula for the […]
Quantum 6, 802 (2022). https://doi.org/10.22331/q-2022-09-08-802 The challenge of quantum computing is to combine error resilience with universal computation. Diagonal gates such as the transversal $T$ gate play an important role in implementing a universal set […]
Quantum 6, 801 (2022). https://doi.org/10.22331/q-2022-09-08-801 We introduce unique class of cyclic quantum thermal machines (QTMs) which can maximize their performance at the finite value of cycle duration $tau$ where they are most irreversible. These QTMs […]
Quantum 6, 800 (2022). https://doi.org/10.22331/q-2022-09-08-800 We propose a continuous-variable (CV) SWAP test that requires no ancilla register, thereby generalizing the ancilla-free SWAP test for qubits. In this ancilla-free CV SWAP test, the computational basis measurement […]
Quantum 6, 799 (2022). https://doi.org/10.22331/q-2022-09-08-799 In certain regimes, the fidelity of quantum states will decay at a rate set by the classical Lyapunov exponent. This serves both as one of the most important examples of […]
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