Quantum 5, 466 (2021). https://doi.org/10.22331/q-2021-06-04-466 In this paper, we propose a general scheme to analyze the gradient vanishing phenomenon, also known as the barren plateau phenomenon, in training quantum neural networks with the ZX-calculus. More […]
Quantum 5, 465 (2021). https://doi.org/10.22331/q-2021-06-02-465 The problem of sampling outputs of quantum circuits has been proposed as a candidate for demonstrating a quantum computational advantage (sometimes referred to as quantum “supremacy”). In this work, we […]
Quantum 5, 464 (2021). https://doi.org/10.22331/q-2021-06-01-464 Measurement noise is one of the main sources of errors in currently available quantum devices based on superconducting qubits. At the same time, the complexity of its characterization and mitigation […]
Quantum 5, 463 (2021). https://doi.org/10.22331/q-2021-06-01-463 We give an upper bound on the resources required for valuable quantum advantage in pricing derivatives. To do so, we give the first complete resource estimates for useful quantum derivative […]
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 […]
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 […]
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