Quantum 5, 495 (2021). https://doi.org/10.22331/q-2021-07-05-495 We consider simulating quantum systems on digital quantum computers. We show that the performance of quantum simulation can be improved by simultaneously exploiting commutativity of the target Hamiltonian, sparsity of […]
Quantum 5, 494 (2021). https://doi.org/10.22331/q-2021-07-05-494 One of the lowest-order corrections to Gaussian quantum mechanics in infinite-dimensional Hilbert spaces are Airy functions: a uniformization of the stationary phase method applied in the path integral perspective. We […]
Quantum 5, 493 (2021). https://doi.org/10.22331/q-2021-07-01-493 Certification of nonlocality of quantum mechanics is an important fundamental test that typically requires prolonged data collection and is only revealed in an in-depth analysis. These features are often particularly […]
Quantum 5, 492 (2021). https://doi.org/10.22331/q-2021-07-01-492 We present a hardware agnostic error mitigation algorithm for near term quantum processors inspired by the classical Lanczos method. This technique can reduce the impact of different sources of noise […]
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. […]
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