Quantum 7, 1122 (2023). https://doi.org/10.22331/q-2023-09-26-1122 Recently, a class of fractal surface codes (FSCs), has been constructed on fractal lattices with Hausdorff dimension $2+epsilon$, which admits a fault-tolerant non-Clifford CCZ gate [1]. We investigate the performance […]
Quantum 7, 1121 (2023). https://doi.org/10.22331/q-2023-09-26-1121 We generalize the Quantum Approximate Optimization Algorithm (QAOA) of Farhi et al. (2014) to allow for arbitrary separable initial states with corresponding mixers such that the starting state is the […]
Quantum 7, 1120 (2023). https://doi.org/10.22331/q-2023-09-25-1120 Symmetry is a unifying concept in physics. In quantum information and beyond, it is known that quantum states possessing symmetry are not useful for certain information-processing tasks. For example, states […]
Quantum 7, 1119 (2023). https://doi.org/10.22331/q-2023-09-25-1119 Quantum interference phenomena are widely viewed as posing a challenge to the classical worldview. Feynman even went so far as to proclaim that they are the $textit{only mystery}$ and the […]
Quantum 7, 1118 (2023). https://doi.org/10.22331/q-2023-09-25-1118 Superconducting quantum circuits are a promising hardware platform for realizing a fault-tolerant quantum computer. Accelerating progress in this field of research demands general approaches and computational tools to analyze and […]
Quantum 7, 1117 (2023). https://doi.org/10.22331/q-2023-09-21-1117 Sharing multi-partite quantum entanglement between parties allows for diverse secure communication tasks to be performed. Among them, conference key agreement (CKA) – an extension of key distribution to multiple parties […]
Quantum 7, 1116 (2023). https://doi.org/10.22331/q-2023-09-21-1116 We consider the combined effect of readout errors and coherent errors, i.e., deterministic phase rotations, on the surface code. We use a recently developed numerical approach, via a mapping of […]
Quantum 7, 1115 (2023). https://doi.org/10.22331/q-2023-09-15-1115 It is widely accepted that the dynamic of entanglement in presence of a generic circuit can be predicted by the knowledge of the statistical properties of the entanglement spectrum. We […]
Quantum 7, 1114 (2023). https://doi.org/10.22331/q-2023-09-15-1114 The device-independent paradigm has had spectacular successes in randomness generation, key distribution and self-testing, however most of these results have been obtained under the assumption that parties hold trusted and […]
Quantum 7, 1113 (2023). https://doi.org/10.22331/q-2023-09-14-1113 Although tensor networks are powerful tools for simulating low-dimensional quantum physics, tensor network algorithms are very computationally costly in higher spatial dimensions. We introduce $textit{quantum gauge networks}$: a different kind […]
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