Quantum 5, 462 (2021). https://doi.org/10.22331/q-2021-05-27-462 In this paper, we derive sharp lower bounds, also known as quantum speed limits, for the time it takes to transform a quantum system into a state such that an […]
Tag: quantumjournal
Quantum 5, 461 (2021). https://doi.org/10.22331/q-2021-05-27-461 Nonlinear SU(1,1) interferometers are fruitful and promising tools for spectral engineering and precise measurements with phase sensitivity below the classical bound. Such interferometers have been successfully realized in bulk and […]
Quantum 5, 460 (2021). https://doi.org/10.22331/q-2021-05-26-460 The power of a quantum circuit is determined through the number of two-qubit entangling gates that can be performed within the coherence time of the system. In the absence of […]
Quantum 5, 459 (2021). https://doi.org/10.22331/q-2021-05-26-459 The accuracy of quantum dynamics simulation is usually measured by the error of the unitary evolution operator in the operator norm, which in turn depends on certain norm of the […]
Quantum 5, 458 (2021). https://doi.org/10.22331/q-2021-05-26-458 We theoretically analyze the phase sensitivity of the Induced-Coherence (Mandel-Type) Interferometer, including the case where the sensitivity is “boosted” into the bright input regime with coherent-light seeding. We find scaling […]
Quantum 5, 457 (2021). https://doi.org/10.22331/q-2021-05-21-457 We introduce a general framework for analysing general probabilistic theories, which emphasises the distinction between the dynamical and probabilistic structures of a system. The dynamical structure is the set of […]
Quantum 5, 456 (2021). https://doi.org/10.22331/q-2021-05-14-456 We describe the $textit{contextual subspace variational quantum eigensolver}$ (CS-VQE), a hybrid quantum-classical algorithm for approximating the ground state energy of a Hamiltonian. The approximation to the ground state energy is […]
Quantum 5, 455 (2021). https://doi.org/10.22331/q-2021-05-10-455 A number of physically intuitive results for the calculation of multi-time correlations in phase-space representations of quantum mechanics are obtained. They relate time-dependent stochastic samples to multi-time observables, and rely […]
Quantum 5, 454 (2021). https://doi.org/10.22331/q-2021-05-04-454 We propose and analyze a set of variational quantum algorithms for solving quadratic unconstrained binary optimization problems where a problem consisting of $n_c$ classical variables can be implemented on $mathcal […]
Quantum 5, 453 (2021). https://doi.org/10.22331/q-2021-05-04-453 It is well known that a quantum circuit on $N$ qubits composed of Clifford gates with the addition of $k$ non Clifford gates can be simulated on a classical computer […]
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