Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Certified bounds on optimization problems in quantum theory
Younes Naceur, Jie Wang, Victor Magron +1 more·Dec 19, 2025
Semidefinite relaxations of polynomial optimization have become a central tool for addressing the non-convex optimization problems over non-commutative operators that are ubiquitous in quantum information theory and, more in general, quantum physics....
Inclusion constants for free spectrahedra with applications to quantum incompatibility
Andreas Bluhm, Eric Evert, Igor Klep +2 more·Dec 19, 2025
Building on the matrix cube problem, inclusions of free spectrahedra have been used successfully to obtain relaxations of hard spectrahedral inclusion problems. The quality of such a relaxation is quantified by the inclusion constant associated with ...
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...
Non-Gaussian entanglement revealed by higher-order quadrature cumulants
Abhinav Verma, Olga Solodovnikova, Jonas S. Neergaard-Nielsen +1 more·Dec 19, 2025
Entanglement is central to quantum physics, yet detecting and exploiting it in non-Gaussian systems remains a major challenge. In continuous variable platforms, standard inseparability criteria based on Gaussian statistics-such as the Duan-Simon crit...
Quantum heat current in Terahertz-driven phonon systems
Yulong Qiao, Richard. Matthias Geilhufe·Dec 19, 2025
The advent of high-intensity ultrafast laser pulses has opened new opportunities for controlling and designing quantum materials. In particular, terahertz (THz) pulses can resonantly drive optical phonon modes, enabling dynamic manipulation of lattic...
Fraud detection in credit card transactions using Quantum-Assisted Restricted Boltzmann Machines
João Marcos Cavalcanti de Albuquerque Neto, Gustavo Castro do Amaral, Guilherme Penello Temporão·Dec 19, 2025
Use cases for emerging quantum computing platforms become economically relevant as the efficiency of processing and availability of quantum computers increase. We assess the performance of Restricted Boltzmann Machines (RBM) assisted by quantum compu...
$Λ$-Enhanced Gray Molasses Cooling of $^{85}$Rb Atoms in Tweezers Using the D$_2$ Line
Deon Janse van Rensburg, Rogier Venderbosch, Yuri van der Werf +5 more·Dec 19, 2025
We demonstrate the implementation of $Λ$-enhanced gray molasses cooling on the D$_2$ line of $^{85}$Rb atoms in an optical tweezer array. This technique yields lower atomic temperatures of 4.0(2) $μ$K compared to red-detuned polarization gradient coo...
The threshold for quantum-classical correspondence is $D \sim \hbar^{\frac43}$
Felipe Hernández, Daniel Ranard, C. Jess Riedel·Dec 19, 2025
In chaotic quantum systems, an initially localized quantum state can deviate strongly from the corresponding classical phase-space distribution after the Ehrenfest time $t_{\mathrm{E}} \sim \log(\hbar^{-1})$, even in the limit $\hbar \to 0$. Decohere...
Quantum state of interacting primordial inhomogeneities: de-squeezing and decoherence
Amaury Micheli, Yuto Oshima, Tomo Takahashi·Dec 19, 2025
We investigate how interactions affect the quantum state of scalar perturbations during inflation and the quantum correlations they may exhibit. Focusing on the case of scalar perturbations in single-field inflation, we model interactions using a Lin...
Frequency-Multiplexed Millimeter-Wave Fault-Tolerant Superconducting Qubits Enabled by an On-Chip Nonreciprocal Control Bus
Sajjad Taravati·Dec 19, 2025
Scaling superconducting quantum processors is fundamentally limited by the escalating complexity of cryogenic wiring and the debilitating effects of microwave crosstalk and Purcell decay. This paper proposes the concept of frequency-multiplexed milli...
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...
Quantum Mechanics in a Spherical Wedge: Complete Solution and Implications for Angular Momentum Theory
Mustafa Bakr, Smain Amari·Dec 19, 2025
We solve the stationary Schrödinger equation for a particle confined to a 3D spherical wedge -- the region $\{(r,θ,φ): 0 \leq r \leq R,\, 0 \leq θ\leq π,\, 0 \leq φ\leq Φ\}$ with Dirichlet BCs on all surfaces. This exactly solvable constrained-domain...
Group-theoretical analysis of quantum complexity: the oscillator group case
K. Andrzejewski, K. Bolonek-Lasoń, P. Kosiński·Dec 19, 2025
Motivated by the recent rapid development of complexity theory applied to quantum mechanical processes we present the complete derivation of Nielsen's complexity of unitaries belonging to the representations of oscillator group. Our approach is based...
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...
Coherent phase control of orbital-angular-momentum light-induced torque in a double-tripod atom-light coupling scheme
Hamid R. Hamedi, Viačeslav Kudriašov, Mažena Mackoit-Sinkevičienė +1 more·Dec 19, 2025
We investigate a phase-controllable mechanism for generating optical torque in a five-level double-tripod (DT) atom-light coupling scheme interacting with four strong coherent control fields as well as two weak optical vortex probe beams carrying orb...
Advantages and disadvantages of maximally entangled states in dilaton black hole background
Zhen Yang, He Cheng, Si-Han Li·Dec 19, 2025
We investigate quantum entanglement and coherence for four classes of Bell-like fermionic states in the vicinity of the event horizon of a Garfinkle-Horowitz-Strominger (GHS) dilaton black hole. Contrary to the common expectation that maximally entan...
Refrigeration of a 1D gas of microwave photons
Lukas Schamriß, Louis Garbe, Peter Rabl·Dec 19, 2025
We discuss a conceptually simple scheme for cooling a one dimensional gas of microwave photons in a superconducting transmission line. By shunting one end of the transmission line by a nonlinear Josephson element, we show how a cooling mechanism can ...
Autonomous Picosecond-Precision Synchronization in Measurement-Device-Independent Quantum Key Distribution
A. P. Pljonkin·Dec 19, 2025
Measurement-device-independent quantum key distribution (MDI-QKD) eliminates detector side-channel attacks by relocating all measurements to an untrusted intermediate node. However, its practical implementation critically relies on picosecond-level t...
Bias-Class Discrimination of Universal QRAM Boolean Memories
Leonardo Bohac·Dec 19, 2025
We study the discrimination of Boolean memory configurations via a fixed Universal QRAM (U-QRAM) interface. Given query access to a quantum memory storing an unknown Boolean function $f:[N]\to\{0,1\}$, we ask: what can be inferred about the bias clas...