Quantum 5, 474 (2021). https://doi.org/10.22331/q-2021-06-10-474 At the dawn of Quantum Physics, Wigner and Weisskopf obtained a full analytical description (a $textit{photon portrait}$) of the emission of a single photon by a two-level system, using the […]
Quantum 5, 473 (2021). https://doi.org/10.22331/q-2021-06-10-473 Recently a new class of quantum algorithms that are based on the quantum computation of the connected moment expansion has been reported to find the ground and excited state energies. […]
Quantum 5, 472 (2021). https://doi.org/10.22331/q-2021-06-10-472 This work analyzes correlations arising from quantum systems subject to sequential projective measurements to certify that the system in question has a quantum dimension greater than some $d$. We refine […]
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 […]
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