Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Logical gates on Floquet codes via folds and twists
Alexandra E. Moylett, Bhargavi Jonnadula·Dec 19, 2025
Floquet codes have recently emerged as a new family of error-correcting codes, and have drawn significant interest across both theoretical and practical quantum computing. A central open question has been how to implement logical operations on these ...
Digital-Analog Quantum Computing with Qudits
Alatz Alvarez-Ahedo, Mikel Garcia de Andoin, Mikel Sanz·Dec 19, 2025
Digital-analog quantum computing with two-level systems is a computational paradigm that combines an analog Hamiltonian with single-qubit gates to achieve universality. We extend this framework to $d$-level systems by conjugating an analog Hamiltonia...
Investigating methods to solve large windfarm optimization problems with a minimum number of qubits using circuit-based quantum computers
James Hancock, Matthew Craven, Craig McNeile·Dec 19, 2025
This study investigates quantum computing approaches for solving the windfarm layout optimization (WFLO) problems formulated as a quadratic unconstrained binary optimization (QUBO) problem. We investigate two encoding methods that require fewer than ...
A Polylogarithmic-Time Quantum Algorithm for the Laplace Transform
Akash Kumar Singh, Ashish Kumar Patra, Anurag K. S. V. +3 more·Dec 19, 2025
We introduce a quantum algorithm to perform the Laplace transform on quantum computers. Already, the quantum Fourier transform (QFT) is the cornerstone of many quantum algorithms, but the Laplace transform or its discrete version has not seen any eff...
Bloch Motions and Spinning Tops
Albert Huber, Paul Schreivogl·Dec 19, 2025
This work investigates the dynamics of closed quantum systems in the Bloch vector representation using methods from rigid body dynamics and the theory of integrable systems. To this end, equations of motion for Bloch components are derived from the v...
Single-Photon Scattering in a Waveguide Coupled to a Lossy or Gain Giant Atom
Yu Xin, Jia-Ming Zhang, Bing Chen·Dec 19, 2025
This work investigates single-photon scattering in a one-dimensional coupled-resonator waveguide coupled to a giant atom with a complex on-site energy. Within the generalized projection operator formalism, we derive analytical expressions for the sca...
Topological magic response in quantum spin chains
Ritu Nehra, Poetri Sonya Tarabunga, Martina Frau +3 more·Dec 18, 2025
Topological matter provides natural platforms for robust, non-local information storage, central to quantum error correction. Yet, while the relation between entanglement and topology is well established, little is known about the role of nonstabiliz...
Fast Native Three-Qubit Gates and Fault-Tolerant Quantum Error Correction with Trapped Rydberg Ions
Katrin Bolsmann, Thiago L. M. Guedes, Weibin Li +3 more·Dec 18, 2025
Trapped ions as one of the most promising quantum-information-processing platforms, yet conventional entangling gates mediated by collective motion remain slow and difficult to scale. Exciting trapped ions to high-lying electronic Rydberg states prov...
Prefix Sums via Kronecker Products
Aleksandros Sobczyk, Anastasios Zouzias·Dec 18, 2025
In this work, we revisit prefix sums through the lens of linear algebra. We describe an identity that decomposes triangular all-ones matrices as a sum of two Kronecker products, and apply it to design recursive prefix sum algorithms and circuits. Not...
Antisymmetrization of composite fermionic states for quantum simulations of nuclear reactions in first-quantization mapping
Ionel Stetcu·Dec 18, 2025
I present a first-quantization deterministic algorithm for antisymmetrizing a spatially separated target-projectile system containing $N_T$ and $N_p$ identical fermions, respectively. The method constructs a fully antisymmetric wavefunction from the ...
Energy Inference of Black-Box Quantum Computers Using Quantum Speed Limit
Nobumasa Ishida, Yoshihiko Hasegawa·Dec 17, 2025
Cloud-based quantum computers do not provide users with access to hardware-level information such as the underlying Hamiltonians, which obstructs the characterization of their physical properties. We propose a method to infer the energy scales of gat...
A Quantum Bluestein's Algorithm for Arbitrary-Size Quantum Fourier Transform
Nan-Hong Kuo, Renata Wong·Dec 17, 2025
We propose a quantum analogue of Bluestein's algorithm (QBA) that implements an exact $N$-point Quantum Fourier Transform (QFT) for arbitrary $N$. Our construction factors the $N$-dimensional QFT unitary into three diagonal quadratic-phase gates and ...
Wave-packet dynamics in pseudo-Hermitian lattices: Coexistence of Hermitian and non-Hermitian wavefronts
Alon Beck, Moshe Goldstein·Dec 17, 2025
This paper investigates wave-packet dynamics in non-Hermitian lattice systems and reveals a surprising phenomenon: The simultaneous propagation of two distinct wavefronts, one traveling at the non-Hermitian velocity and the other at the Hermitian vel...
Universal Blind Quantum Computation with Recursive Rotation Gates
Mohit Joshi, Manoj Kumar Mishra, S. Karthikeyan·Dec 17, 2025
Blind Quantum Computation lets a limited-capability client delegate its complex computation to a remote server without revealing its data or computation. Several such protocols have been proposed under varied quantum computing models. However, these ...
Bosonic quantum computing with near-term devices and beyond
Timo Hillmann·Dec 17, 2025
(Abridged.) This thesis investigates scalable fault-tolerant quantum computation through the development of bosonic quantum codes, quantum LDPC codes, and decoding protocols that connect continuous-variable and discrete-variable error correction. We ...
A quantum advection-diffusion solver using the quantum singular value transform
Gard Olav Helle, Tommaso Benacchio, Anna Bomme Ousager +1 more·Dec 16, 2025
We present a quantum algorithm for the simulation of the linear advection-diffusion equation based on block encodings of high order finite-difference operators and the quantum singular value transform. Our complexity analysis shows that the higher or...
Growth and spreading of quantum resources under random circuit dynamics
Sreemayee Aditya, Xhek Turkeshi, Piotr Sierant·Dec 16, 2025
Quantum many-body dynamics generate nonclassical correlations naturally described by quantum resource theories. Quantum magic resources (or nonstabilizerness) capture deviation from classically simulable stabilizer states, while coherence and fermion...
Improved Lower Bounds for QAC0
Malvika Raj Joshi, Avishay Tal, Francisca Vasconcelos +1 more·Dec 16, 2025
In this work, we prove the strongest known lower bounds for QAC$^0$, allowing polynomially many gates and ancillae. Our main results show that: (1) Depth-3 QAC$^0$ circuits cannot compute PARITY, and require $Ω(\exp(\sqrt{n}))$ gates to compute MAJOR...
Sequential realization of Quantum Instruments
Soham Sau, Michal Sedlák·Dec 16, 2025
In adaptive quantum circuits classical results of mid-circuit measurements determine the upcoming gates. This allows POVMs, quantum channels or more generally quantum instruments to be implemented sequentially, so that fewer qubits need to be used at...
General Quantum Instruction for Communication via Maximally Entangled $n$-Qubit States
Saba Arife Bozpolat·Dec 16, 2025
This study presents a generalized $n$-bit superdense coding protocol that enables the transmission of n classical bits of information using an entangled n--qubit quantum system and the transmission of $n-1$ qubits. The protocol involves creating a ma...