Quantum 5, 471 (2021). https://doi.org/10.22331/q-2021-06-08-471 Negativity of the Wigner function is arguably one of the most striking non-classical features of quantum states. Beyond its fundamental relevance, it is also a necessary resource for quantum speedup […]
Quantum 5, 470 (2021). https://doi.org/10.22331/q-2021-06-08-470 Recently, it was shown that when reference frames are associated to quantum systems, the transformation laws between such quantum reference frames need to be modified to take into account the […]
Quantum 5, 469 (2021). https://doi.org/10.22331/q-2021-06-07-469 We describe an efficient implementation of Bayesian quantum phase estimation in the presence of noise and multiple eigenstates. The main contribution of this work is the dynamic switching between different […]
Quantum 5, 468 (2021). https://doi.org/10.22331/q-2021-06-04-468 We study the implications of the anyon fusion equation $atimes b=c$ on global properties of $2+1$D topological quantum field theories (TQFTs). Here $a$ and $b$ are anyons that fuse together […]
Quantum 5, 467 (2021). https://doi.org/10.22331/q-2021-06-04-467 Estimating correctly the quantum phase of a physical system is a central problem in quantum parameter estimation theory due to its wide range of applications from quantum metrology to cryptography. […]
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 […]
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