Quantum

Paper

A scalable and fast artificial neural network syndrome decoder for surface codes

Spiro Gicev, Lloyd C. L. Hollenberg, and Muhammad Usman,

Quantum 7, 1058 (2023).

Surface code error correction offers a highly promising pathway to achieve scalable fault-tolerant quantum computing. When operated as stabilizer codes, surface code computations consist of…

Paper

Quantum Goemans-Williamson Algorithm with the Hadamard Test and Approximate Amplitude Constraints

Taylor L. Patti, Jean Kossaifi, Anima Anandkumar, and Susanne F. Yelin,

Quantum 7, 1057 (2023).

Semidefinite programs are optimization methods with a wide array of applications, such as approximating difficult combinatorial problems. One such semidefinite program is the Goemans-William…

Paper

On Hitting Times for General Quantum Markov Processes

Lorenzo Laneve, Francesco Tacchino, and Ivano Tavernelli,

Quantum 7, 1056 (2023).

Random walks (or Markov chains) are models extensively used in theoretical computer science. Several tools, including analysis of quantities such as hitting and mixing times, are helpful for…

Paper

Geometric Operator Quantum Speed Limit, Wegner Hamiltonian Flow and Operator Growth

Niklas Hörnedal, Nicoletta Carabba, Kazutaka Takahashi, and Adolfo del Campo,

Quantum 7, 1055 (2023).

Quantum speed limits (QSLs) provide lower bounds on the minimum time required for a process to unfold by using a distance between quantum states and identifying the speed of evolution or an…

Paper

Quantum correlations on the no-signaling boundary: self-testing and more

Kai-Siang Chen, Gelo Noel M. Tabia, Chellasamy Jebarathinam, Shiladitya Mal, Jun-Yi Wu, and Yeong-Cherng Liang,

Quantum 7, 1054 (2023).

In device-independent quantum information, correlations between local measurement outcomes observed by spatially separated parties in a Bell test play a fundamental role. Even though it is l…

Paper

Semi-device-dependent blind quantum tomography

Ingo Roth, Jadwiga Wilkens, Dominik Hangleiter, and Jens Eisert,

Quantum 7, 1053 (2023).

Extracting tomographic information about quantum states is a crucial task in the quest towards devising high-precision quantum devices. Current schemes typically require measurement devices…

Paper

“Proper” Shift Rules for Derivatives of Perturbed-Parametric Quantum Evolutions

Dirk Oliver Theis,

Quantum 7, 1052 (2023).

Banchi & Crooks (Quantum, 2021) have given methods to estimate derivatives of expectation values depending on a parameter that enters via what we call a "perturbed" quantum evolution…

Paper

Counterexamples in self-testing

Laura Mančinska and Simon Schmidt,

Quantum 7, 1051 (2023).

In the recent years self-testing has grown into a rich and active area of study with applications ranging from practical verification of quantum devices to deep complexity theoretic results.…

Paper

A quantum logic gate for free electrons

Stefan Löffler, Thomas Schachinger, Peter Hartel, Peng-Han Lu, Rafal E. Dunin-Borkowski, Martin Obermair, Manuel Dries, Dagmar Gerthsen, and Peter Schattschneider,

Quantum 7, 1050 (2023).

The topological charge $m$ of vortex electrons spans an infinite-dimensional Hilbert space. Selecting a two-dimensional subspace spanned by $m=\pm 1$, a beam electron in a transmission electron…

Paper

Quantum simulation of battery materials using ionic pseudopotentials

Modjtaba Shokrian Zini, Alain Delgado, Roberto dos Reis, Pablo Antonio Moreno Casares, Jonathan E. Mueller, Arne-Christian Voigt, and Juan Miguel Arrazola,

Quantum 7, 1049 (2023).

Ionic pseudopotentials are widely used in classical simulations of materials to model the effective potential due to the nucleus and the core electrons. Modeling fewer electrons explicitly r…

Paper