Paper Pure non-Markovian evolutions Dario De Santis, Quantum 7, 1124 (2023). Non-Markovian dynamics are characterized by information backflows, where the evolving open quantum system retrieves part of the information previously lost in the environment. Hence, the ver…
Paper Correcting non-independent and non-identically distributed errors with surface codes Konstantin Tiurev, Peter-Jan H. S. Derks, Joschka Roffe, Jens Eisert, and Jan-Michael Reiner, Quantum 7, 1123 (2023). A common approach to studying the performance of quantum error correcting codes is to assume independent and identically distributed single-qubit errors. However, the available experimental…
Paper Quantum error correction with fractal topological codes Arpit Dua, Tomas Jochym-O’Connor, and Guanyu Zhu, Quantum 7, 1122 (2023). 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 i…
Paper Warm-Started QAOA with Custom Mixers Provably Converges and Computationally Beats Goemans-Williamson’s Max-Cut at Low Circuit Depths Reuben Tate, Jai Moondra, Bryan Gard, Greg Mohler, and Swati Gupta, Quantum 7, 1121 (2023). 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 st…
Paper Testing symmetry on quantum computers Margarite L. LaBorde, Soorya Rethinasamy, and Mark M. Wilde, Quantum 7, 1120 (2023). 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…
Paper Why interference phenomena do not capture the essence of quantum theory Lorenzo Catani, Matthew Leifer, David Schmid, and Robert W. Spekkens, Quantum 7, 1119 (2023). 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…
Paper Analysis of arbitrary superconducting quantum circuits accompanied by a Python package: SQcircuit Taha Rajabzadeh, Zhaoyou Wang, Nathan Lee, Takuma Makihara, Yudan Guo, and Amir H. Safavi-Naeini, Quantum 7, 1118 (2023). 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…
Paper Anonymous conference key agreement in linear quantum networks Jarn de Jong, Frederik Hahn, Jens Eisert, Nathan Walk, and Anna Pappa, Quantum 7, 1117 (2023). 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 dis…
Paper Coherent errors and readout errors in the surface code Áron Márton and János K. Asbóth, Quantum 7, 1116 (2023). 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…
Paper Random unitaries, Robustness, and Complexity of Entanglement J. Odavić, G. Torre, N. Mijić, D. Davidović, F. Franchini, and S. M. Giampaolo, Quantum 7, 1115 (2023). 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 teste…
Paper Tilted Hardy paradoxes for device-independent randomness extraction Shuai Zhao, Ravishankar Ramanathan, Yuan Liu, and Paweł Horodecki, Quantum 7, 1114 (2023). 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 assumpti…
Paper Quantum Gauge Networks: A New Kind of Tensor Network Kevin Slagle, Quantum 7, 1113 (2023). Although tensor networks are powerful tools for simulating low-dimensional quantum physics, tensor network algorithms are very computationally costly in higher spatial dimensions. We introdu…
Paper A “thoughtful” Local Friendliness no-go theorem: a prospective experiment with new assumptions to suit Howard M. Wiseman, Eric G. Cavalcanti, and Eleanor G. Rieffel, Quantum 7, 1112 (2023). A recent paper by two of us and co-workers [1], based on an extended Wigner's friend scenario, demonstrated that certain empirical correlations predicted by quantum theory (QT) violate inequ…
Paper Encoding trade-offs and design toolkits in quantum algorithms for discrete optimization: coloring, routing, scheduling, and other problems Nicolas PD Sawaya, Albert T Schmitz, and Stuart Hadfield, Quantum 7, 1111 (2023). Challenging combinatorial optimization problems are ubiquitous in science and engineering. Several quantum methods for optimization have recently been developed, in different settings includ…
Paper Quantum Interior Point Methods for Semidefinite Optimization Brandon Augustino, Giacomo Nannicini, Tamás Terlaky, and Luis F. Zuluaga, Quantum 7, 1110 (2023). We present two quantum interior point methods for semidefinite optimization problems, building on recent advances in quantum linear system algorithms. The first scheme, more similar to a cla…
Paper Noise-robust ground state energy estimates from deep quantum circuits Harish J. Vallury, Michael A. Jones, Gregory A. L. White, Floyd M. Creevey, Charles D. Hill, and Lloyd C. L. Hollenberg, Quantum 7, 1109 (2023). In the lead up to fault tolerance, the utility of quantum computing will be determined by how adequately the effects of noise can be circumvented in quantum algorithms. Hybrid quantum-classi…
