Quantum

Paper

Entanglement Trajectory and its Boundary

Ruge Lin,

Quantum 8, 1282 (2024).

In this article, we present a novel approach to investigating entanglement in the context of quantum computing. Our methodology involves analyzing reduced density matrices at different stage…

Paper

Compiling Quantum Circuits for Dynamically Field-Programmable Neutral Atoms Array Processors

Daniel Bochen Tan, Dolev Bluvstein, Mikhail D. Lukin, and Jason Cong,

Quantum 8, 1281 (2024).

Dynamically field-programmable qubit arrays (DPQA) have recently emerged as a promising platform for quantum information processing. In DPQA, atomic qubits are selectively loaded into arrays…

Paper

Teleportation of Post-Selected Quantum States

Daniel Collins,

Quantum 8, 1280 (2024).

Teleportation allows Alice to send a pre-prepared quantum state to Bob using only pre-shared entanglement and classical communication. Here we show that it is possible to teleport a state wh…

Paper

Time-optimal multi-qubit gates: Complexity, efficient heuristic and gate-time bounds

Pascal Baßler, Markus Heinrich, and Martin Kliesch,

Quantum 8, 1279 (2024).

Multi-qubit entangling interactions arise naturally in several quantum computing platforms and promise advantages over traditional two-qubit gates. In particular, a fixed multi-qubit Ising-t…

Paper

Variational Phase Estimation with Variational Fast Forwarding

Maria-Andreea Filip, David Muñoz Ramo, and Nathan Fitzpatrick,

Quantum 8, 1278 (2024).

Subspace diagonalisation methods have appeared recently as promising means to access the ground state and some excited states of molecular Hamiltonians by classically diagonalising small mat…

Paper

Emergent parallel transport and curvature in Hermitian and non-Hermitian quantum mechanics

Chia-Yi Ju, Adam Miranowicz, Yueh-Nan Chen, Guang-Yin Chen, and Franco Nori,

Quantum 8, 1277 (2024).

Studies have shown that the Hilbert spaces of non-Hermitian systems require nontrivial metrics. Here, we demonstrate how evolution dimensions, in addition to time, can emerge naturally from…

Paper

Quantum circuits for toric code and X-cube fracton model

Penghua Chen, Bowen Yan, and Shawn X. Cui,

Quantum 8, 1276 (2024).

We propose a systematic and efficient quantum circuit composed solely of Clifford gates for simulating the ground state of the surface code model. This approach yields the ground state of th…

Paper

Here comes the SU(N): multivariate quantum gates and gradients

Roeland Wiersema, Dylan Lewis, David Wierichs, Juan Carrasquilla, and Nathan Killoran,

Quantum 8, 1275 (2024).

Variational quantum algorithms use non-convex optimization methods to find the optimal parameters for a parametrized quantum circuit in order to solve a computational problem. The choice of…

Paper

Ergodicity Breaking Under Confinement in Cold-Atom Quantum Simulators

Jean-Yves Desaules, Guo-Xian Su, Ian P. McCulloch, Bing Yang, Zlatko Papić, and Jad C. Halimeh,

Quantum 8, 1274 (2024).

The quantum simulation of gauge theories on synthetic quantum matter devices has gained a lot of traction in the last decade, making possible the observation of a range of exotic quantum man…

Paper

Entanglement dynamics of photon pairs and quantum memories in the gravitational field of the earth

Roy Barzel, Mustafa Gündoğan, Markus Krutzik, Dennis Rätzel, and Claus Lämmerzahl,

Quantum 8, 1273 (2024).

We investigate the effect of entanglement dynamics due to gravity – the basis of a mechanism of universal decoherence – for photonic states and quantum memories in Mach-Zehnder and Hong-Ou-M…

Paper

Entanglement-symmetries of covariant channels

Dominic Verdon,

Quantum 8, 1272 (2024).

Let $G$ and $G'$ be monoidally equivalent compact quantum groups, and let $H$ be a Hopf-Galois object realising a monoidal equivalence between these groups' representation categories. This monoida…

Paper

Dynamical quantum phase transitions from random matrix theory

David Pérez-García, Leonardo Santilli, and Miguel Tierz,

Quantum 8, 1271 (2024).

We uncover a novel dynamical quantum phase transition, using random matrix theory and its associated notion of planar limit. We study it for the isotropic XY Heisenberg spin chain. For this,…

Paper

Identifying families of multipartite states with non-trivial local entanglement transformations

Nicky Kai Hong Li, Cornelia Spee, Martin Hebenstreit, Julio I. de Vicente, and Barbara Kraus,

Quantum 8, 1270 (2024).

The study of state transformations by spatially separated parties with local operations assisted by classical communication (LOCC) plays a crucial role in entanglement theory and its applica…

Paper

Discrimination and certification of unknown quantum measurements

Aleksandra Krawiec, Łukasz Pawela, and Zbigniew Puchała,

Quantum 8, 1269 (2024).

We study the discrimination of von Neumann measurements in the scenario when we are given a reference measurement and some other measurement. The aim of the discrimination is to determine wh…

Paper

Bicolor loop models and their long range entanglement

Zhao Zhang,

Quantum 8, 1268 (2024).

Quantum loop models are well studied objects in the context of lattice gauge theories and topological quantum computing. They usually carry long range entanglement that is captured by the to…

Paper

Towards a measurement theory in QFT: “Impossible” quantum measurements are possible but not ideal

Nicolas Gisin and Flavio Del Santo,

Quantum 8, 1267 (2024).

Naive attempts to put together relativity and quantum measurements lead to signaling between space-like separated regions. In QFT, these are known as $\textit{impossible measurements}$. We sho…

Category: Paper