Quantum

Paper

Border Ranks of Positive and Invariant Tensor Decompositions: Applications to Correlations

Andreas Klingler, Tim Netzer, and Gemma De les Coves,

Quantum 9, 1649 (2025).

The matrix rank and its positive versions are robust for small approximations, i.e. they do not decrease under small perturbations. In contrast, the multipartite tensor rank can collapse for…

Paper

Heisenberg scaling based on population coding

Masahito Hayashi,

Quantum 9, 1648 (2025).

We study Heisenberg scaling of quantum metrology in the viewpoint of population coding. Although Fisher information has been used for a figure of merit to characterize Heisenberg scaling in…

Paper

Synthesis and Arithmetic of Single Qutrit Circuits

Amolak Ratan Kalra, Michele Mosca, and Dinesh Valluri,

Quantum 9, 1647 (2025).

In this paper we study single qutrit circuits consisting of words over the Clifford$+\mathcal{D}$ cyclotomic gate set, where $\mathcal{D}=\text{diag}(\pm\xi^{a},\pm\xi^{b},\pm\xi^{c})$, $\xi$ is a…

Paper

Squashed quantum non-Markovianity: a measure of genuine quantum non-Markovianity in states

Rajeev Gangwar, Tanmoy Pandit, Kaumudibikash Goswami, Siddhartha Das, and Manabendra Nath Bera,

Quantum 9, 1646 (2025).

Quantum non-Markovianity in tripartite quantum states $\rho_{ABC}$ represents a correlation between systems $A$ and $C$ when conditioned on the system $B$ and is known to have both classical and qua…

Paper

Matrix-product unitaries: Beyond quantum cellular automata

Georgios Styliaris, Rahul Trivedi, David Perez-Garcia, and J. Ignacio Cirac,

Quantum 9, 1645 (2025).

Matrix-product unitaries (MPU) are 1D tensor networks describing time evolution and unitary symmetries of quantum systems, while their action on states by construction preserves the entangle…

Paper

On the locality of qubit encodings of local fermionic modes

Tommaso Guaita,

Quantum 9, 1644 (2025).

Known mappings that encode fermionic modes into a bosonic qubit system are non-local transformations. In this paper we establish that this must necessarily be the case, if the locality graph…

Paper

Simple and general bounds on quantum random access codes

Máté Farkas, Nikolai Miklin, and Armin Tavakoli,

Quantum 9, 1643 (2025).

Random access codes are a type of communication task that is widely used in quantum information science. The optimal average success probability that can be achieved through classical strate…

Paper

The Virtual Quantum Device (VQD): A tool for detailed emulation of quantum computers

Cica Gustiani, Tyson Jones, and Simon C. Benjamin,

Quantum 9, 1642 (2025).

We present the Virtual Quantum Device (VQD) platform, a system based on the QuEST quantum emulator. Through the use of VQDs, non-expert users can emulate specific quantum computers with deta…

Paper

On multivariate polynomials achievable with quantum signal processing

Lorenzo Laneve and Stefan Wolf,

Quantum 9, 1641 (2025).

Quantum signal processing (QSP) is a framework which was proven to unify and simplify a large number of known quantum algorithms, as well as discovering new ones. QSP allows one to transform…

Paper

Potential and limitations of random Fourier features for dequantizing quantum machine learning

Ryan Sweke, Erik Recio-Armengol, Sofiene Jerbi, Elies Gil-Fuster, Bryce Fuller, Jens Eisert, and Johannes Jakob Meyer,

Quantum 9, 1640 (2025).

Quantum machine learning is arguably one of the most explored applications of near-term quantum devices. Much focus has been put on notions of variational quantum machine learning where {par…

Paper

Approximating dynamical correlation functions with constant depth quantum circuits

Reinis Irmejs and Raul A. Santos,

Quantum 9, 1639 (2025).

One of the most important quantities characterizing the microscopic properties of quantum systems are dynamical correlation functions. These correlations are obtained by time-evolving a pert…

Paper

Fermionic wave packet scattering: a quantum computing approach

Yahui Chai, Arianna Crippa, Karl Jansen, Stefan Kühn, Vincent R. Pascuzzi, Francesco Tacchino, and Ivano Tavernelli,

Quantum 9, 1638 (2025).

Quantum computing provides a novel avenue towards simulating dynamical phenomena, and, in particular, scattering processes relevant for exploring the structure of matter. However, preparing…

Paper

Information capacity of quantum communication under natural physical assumptions

Jef Pauwels, Stefano Pironio, and Armin Tavakoli,

Quantum 9, 1637 (2025).

The quantum prepare-and-measure scenario has been studied under various physical assumptions on the emitted states. Here, we first discuss how different assumptions are conceptually and form…

Paper

Tight Bounds on the Spooky Pebble Game: Recycling Qubits with Measurements

Niels Kornerup, Jonathan Sadun, and David Soloveichik,

Quantum 9, 1636 (2025).

Pebble games are popular models for analyzing time-space trade-offs. In particular, reversible pebble game strategies are frequently applied in quantum algorithms like Grover's search to eff…

Paper

Efficient Quantum Cooling Algorithm for Fermionic Systems

Lucas Marti, Refik Mansuroglu, and Michael J. Hartmann,

Quantum 9, 1635 (2025).

We present a cooling algorithm for ground state preparation of fermionic Hamiltonians. Our algorithm makes use of the Hamiltonian simulation of the considered system coupled to an ancillary…

Paper

Cutting circuits with multiple two-qubit unitaries

Lukas Schmitt, Christophe Piveteau, and David Sutter,

Quantum 9, 1634 (2025).

Quasiprobabilistic cutting techniques allow us to partition large quantum circuits into smaller subcircuits by replacing non-local gates with probabilistic mixtures of local gates. The cost…

Category: Paper