Papers

Colin Vendromin, Samuel E. Fontaine, J. E. Sipe·Oct 7, 2025

We develop a model for non-Gaussian state generation via spontaneous parametric down-conversion (SPDC) in InGaP microring resonators. The nonlinear Hamiltonian is written in terms of the asymptotic fields for the system, which includes a phantom chan...

Daniel J. Spencer, Andrew Tanggara, Tobias Haug +2 more·Oct 7, 2025

Qudits offer significant advantages over qubit-based architectures, including more efficient gate compilation, reduced resource requirements, improved error-correction primitives, and enhanced capabilities for quantum communication and cryptography. ...

Mário J. de Oliveira·Oct 7, 2025

We express the probabilistic character associated to the wave function by treating it as a stochastic variable. This is accomplished by means of a stochastic equation for the wave function whose noise changes the phase of the wave function but not it...

Erik Karlsson Öhman, Daqing Wang, R. Matthias Geilhufe +1 more·Oct 7, 2025

Interfacing light with quantum systems is an integral part of quantum technology, with the most essential building block being single-photon emitters. Although various platforms exist, each with its individual strengths, molecular emitters boast a un...

Paolo Zanardi, Emanuel Dallas, Faidon Andreadakis·Oct 7, 2025

We introduce the novel concept of mereological quantum phase transition (m-QPTs). Our framework is based on a variational family of operator algebras defining generalized tensor product structures (g-TPS), a parameter-dependent Hamiltonian, and a qua...

Uma Girish·Oct 7, 2025

Quantum computing promises exponential speedups for certain problems, yet fully universal quantum computers remain out of reach and near-term devices are inherently noisy. Motivated by this, we study noisy quantum algorithms and the landscape between...

Borhan Ahmadi, Aravinth Balaji Ravichandran, Paweł Mazurek +2 more·Oct 7, 2025

Quantum hardware increasingly relies on energy reserves that can later be converted into useful work; yet, most battery-like proposals demand coherent drives or engineered non-equilibrium resources, limiting practicality in noisy settings. We develop...

Jonah Kudler-Flam, Edward Witten·Oct 7, 2025

We examine the behavior of sequences of states in the large $N$ limit of AdS/CFT duality in cases in which the bulk duals involve baby universes or black holes. Such sequences generally fail to converge as pure states. Under suitable conditions, such...

Erfan Abbasgholinejad, Sean R. Muleady, Jacob Bringewatt +4 more·Oct 7, 2025

Estimating extensive combinations of local parameters in distributed quantum systems is a central problem in quantum sensing, with applications ranging from magnetometry to timekeeping. While optimal strategies are known for sensing non-interacting H...

Jon Nelson, Joel Rajakumar, Michael J. Gullans·Oct 7, 2025

It has been known for almost 30 years that quantum circuits with interspersed depolarizing noise converge to the uniform distribution at $ω(\log n)$ depth, where $n$ is the number of qubits, making them classically simulable. We show that under the r...

Ludovico Lami·Oct 7, 2025

Given a sequence of random variables $X^n=X_1,\ldots, X_n$, discriminating between two hypotheses on the underlying probability distribution is a key task in statistics and information theory. Of interest here is the Stein exponent, i.e. the largest ...

Ludovico Lami·Oct 7, 2025

Given two families of quantum states $A$ and $B$, called the null and the alternative hypotheses, quantum hypothesis testing is the task of determining whether an unknown quantum state belongs to $A$ or $B$. Mistaking $A$ for $B$ is a type I error, a...

Mengjie Yang, Ching Hua Lee·Oct 7, 2025

We establish a novel mechanism for topological transitions in non-Hermitian systems that are controlled by the system size. Based on a new paradigm known as exceptional-bound (EB) band engineering, its mechanism hinges on the unique critical scaling ...

J. Tuziemski, J. Pawłowski, P. Tarasiuk +2 more·Oct 7, 2025

A robust definition of quantum runtime is essential for assessing the performance of quantum algorithms and claims of quantum advantage. While for most classical hardware the total runtime is well approximated by computation plus a weakly varying con...

Thomas Iadecola·Oct 7, 2025

In quantum many-body systems with kinetically constrained dynamics, the Hilbert space can split into exponentially many disconnected subsectors, a phenomenon known as Hilbert-space fragmentation. We study the interplay of such fragmentation with symm...

Su-un Lee, Soumik Ghosh, Changhun Oh +3 more·Oct 7, 2025

We study the classical simulability of noisy random quantum circuits under general noise models. While various classical algorithms for simulating noisy random circuits have been proposed, many of them rely on the anticoncentration property, which ca...

Naomi R. Solomons, Damian Markham·Oct 7, 2025

Networks of sensors are a promising scheme to deliver the benefits of quantum technologies in coming years, offering enhanced precision and accuracy for distributed metrology through the use of large entangled states. Recent work has additionally exp...

Alena Romanova, Wolfgang Dür·Oct 7, 2025

We discuss how blind quantum computing generalizes to multi-level quantum systems (qudits), which offers advantages compared to the qubit approach. Here, a quantum computing task is delegated to an untrusted server while simultaneously preventing the...

Yifan F. Zhang, Su-un Lee, Liang Jiang +1 more·Oct 7, 2025

While quantum computing can accomplish tasks that are classically intractable, the presence of noise may destroy this advantage in the absence of fault tolerance. In this work, we present a classical algorithm that runs in $n^{\rm{polylog}(n)}$ time ...

Yihui Quek·Oct 7, 2025

Classical hardness-of-sampling results are largely established for random quantum circuits, whereas analog simulators natively realize time evolutions under geometrically local Hamiltonians. Does a typical such Hamiltonian already yield classically-i...