Quantum 5, 491 (2021). https://doi.org/10.22331/q-2021-07-01-491 The quantum approximate optimization algorithm (QAOA) is a prospective near-term quantum algorithm due to its modest circuit depth and promising benchmarks. However, an external parameter optimization required in QAOA could […]
Quantum 5, 490 (2021). https://doi.org/10.22331/q-2021-07-01-490 We propose a parameter estimation protocol for generalized Pauli channels acting on $d$-dimensional Hilbert space. The salient features of the proposed method include product probe states and measurements, the number […]
Quantum 5, 489 (2021). https://doi.org/10.22331/q-2021-07-01-489 We show that the quantum Fisher information attained in an adiabatic approach to critical quantum metrology cannot lead to the Heisenberg limit of precision and therefore $regular$ quantum metrology under […]
Quantum 5, 488 (2021). https://doi.org/10.22331/q-2021-06-29-488 A programmable quantum processor uses the states of a program register to specify one element of a set of quantum channels which is applied to an input register. It is […]
Quantum 5, 487 (2021). https://doi.org/10.22331/q-2021-06-29-487 Physical qubits in experimental quantum information processors are inevitably exposed to different sources of noise and imperfections, which lead to errors that typically accumulate hindering our ability to perform long […]
Quantum 5, 486 (2021). https://doi.org/10.22331/q-2021-06-29-486 Interacting quantum systems in the chaotic domain are at the core of various ongoing studies of many-body physics, ranging from the scrambling of quantum information to the onset of thermalization. […]
Quantum 5, 485 (2021). https://doi.org/10.22331/q-2021-06-29-485 Geometric intuition is a crucial tool to obtain deeper insight into many concepts of physics. A paradigmatic example of its power is the Bloch ball, the geometrical representation for the […]
Quantum 5, 484 (2021). https://doi.org/10.22331/q-2021-06-29-484 The predictions of quantum theory resist generalised noncontextual explanations. In addition to the foundational relevance of this fact, the particular extent to which quantum theory violates noncontextuality limits available quantum […]
Quantum 5, 483 (2021). https://doi.org/10.22331/q-2021-06-29-483 Singular value decomposition is central to many problems in engineering and scientific fields. Several quantum algorithms have been proposed to determine the singular values and their associated singular vectors of […]
Quantum 5, 482 (2021). https://doi.org/10.22331/q-2021-06-24-482 The new bound on quantum speed limit (in terms of relative purity) is derived by applying the original Mandelstam-Tamm one to the evolution in the space of Hilbert-Schmidt operators acting […]
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