Delft University of Technology

InferQ: A Database-Oriented Benchmark for Quantum Circuits Simulation

Andrei Ilinescu, Aadi Patwardhan, Rihan Hai

Recent work suggests that relational database management systems (RDBMSs) can execute quantum circuit simulation by compiling the simulation into SQL workloads (primarily join-and-…

Constrained Quantum Optimization via Iterative Warm-Start XY-Mixers

David Bucher, Maximilian Janetschek, Michael Poppel +3

The Quantum Approximate Optimization Algorithm (QAOA) is a leading hybrid heuristic for combinatorial optimization, but efficiently handling hard constraints remains a significant…

Exploration of Fluxonium Parameters for Capacitive Cross-Resonance Gates

Eugene Y. Huang, Christian Kraglund Andersen

We study the cross-resonance effect in capacitively-coupled fluxonium qubits and devise a simple formula for their maximum ZX interaction strength. By going beyond the perturbative…

quant-ph2026★ 3 cited

Experimental demonstration of optimal measurement for unambiguously discriminating asymmetric qudit states

Kang-Min Hu, Min Namkung, Myung-Hyun Sohn +1

Identification of nonorthogonal quantum states without error is crucial for various applications in quantum information technology, as well as the foundations of quantum physics. T…

Multi-level spectral navigation with geometric diabatic-adiabatic control

Christian Ventura-Meinersen, Edmondo Valvo, Stefano Bosco +1

We introduce a geometric framework for efficient few-parameter pulse optimization in multi-level quantum systems, enabling high-fidelity state transfer beyond the adiabatic limit.…

Entanglement improves coordination in distributed systems

Francisco Ferreira da Silva, Stephanie Wehner

Coordination in distributed systems is often hampered by communication latency, which degrades performance. Quantum entanglement offers fundamentally stronger correlations than cla…

Highly Tunable Two-Qubit Interactions in Si/SiGe Quantum Dots by Interchanging the Roles of Qubit-Defining Gates

Jaemin Park, Hyeongyu Jang, Hanseo Sohn +5

Silicon quantum dot spin qubits have become a promising platform for scalable quantum computing because of their small size and compatibility with industrial semiconductor manufact…

Above-Unity Coherent Cooperativity of Tin-Vacancy Centers in Diamond Photonic Crystal Cavities

Nina Codreanu, Tim Turan, Daniel Bedialauneta Rodriguez +8

The tin-vacancy center in diamond (SnV) has emerged as a compelling building block for realizing next-generation quantum networks thanks to its excellent optical and spin propertie…

Flux-modulated tunable interaction regimes in two strongly nonlinear oscillators

J. D. Koenig, G. Barbieri, F. Fani Sani +3

The ability to efficiently simulate a variety of interacting quantum systems on a single device is an overarching goal for digital and analog quantum simulators. In circuit quantum…

Fault-Tolerant Non-Clifford GKP Gates using Polynomial Phase Gates and On-Demand Noise Biasing

Minh T. P. Nguyen, Mackenzie H. Shaw

The Gottesman-Kitaev-Preskill (GKP) error correcting code uses a bosonic mode to encode a logical qubit, and has the attractive property that its logical Clifford gates can be impl…

Spectroscopy and Coherence of an Excited-State Transition in Tm $^{3 +}$ :YAlO $_{3}$ at Telecommunication Wavelength

Luozhen Li, Akshay Babu Karyath, Julien Bertrand +12

We characterize spectroscopic and coherence properties of the 1451.37 nm excited-state zero-phonon line (ZPL) between the $^{3} F_{4}$ and the $^{3} H_{4}$ manifolds of a thulium-dop…

Quantum Key Distribution in the Iberian Peninsula

Vicky Domínguez Tubío, Mario Badás Aldecocea, David L. Bakker +3

A promising use of quantum networking is quantum key distribution (QKD), which can provide information-theoretic security unattainable by classical means. While optical fiber-based…

quant-ph2025★ 3 cited

Impact of the local valley splitting on the coherence of conveyor-belt spin shuttling in $^{28}$ Si/SiGe

Mats Volmer, Tom Struck, Jhih-Sian Tu +6

Silicon quantum chips offer a promising path toward scalable, fault-tolerant quantum computing, with the potential to host millions of qubits. However, scaling up dense quantum-dot…

Piecemaker: a resource-efficient entanglement distribution protocol

Luise Prielinger, Kenneth Goodenough, Guus Avis +3

We introduce multipartite entanglement distribution protocols that use a quantum switch to deliver stabilizer states to a number of remote end users. As in existing schemes, the fi…

On-chip stencil lithography for superconducting qubits

Roudy Hanna, Sören Ihssen, Simon Geisert +22

Improvements in circuit design and more recently in materials and surface cleaning have contributed to a rapid development of coherent superconducting qubits. However, organic resi…

Parity Cross-Resonance: A Multiqubit Gate

Xuexin Xu, Siyu Wang, Radhika Joshi +2

We present a native three-qubit entangling gate that exploits engineered interactions to realize control-control-target and control-target-target operations in a single coherent st…

Color it, Code it, Cancel it: k-local dynamical decoupling from classical additive codes

Minh T. P. Nguyen, Maximilian Rimbach-Russ, Stefano Bosco

Dynamical decoupling is a central technique in quantum computing for actively suppressing decoherence and systematic imperfections through sequences of single-qubit operations. Con…

quant-ph2025★ 4 cited

On the Impact of Classical and Quantum Communication Networks Upon Modular Quantum Computing Architecture System Performance

Pau Escofet, Abhijit Das, Sahar Ben Rached +15

Modular architectures are a promising approach to scaling quantum computers beyond the limits of monolithic designs. However, non-local communications between different quantum pro…

A multi-dimensional quantum estimation and model learning framework based on variational Bayesian inference

Federico Belliardo, Erik M. Gauger, Tim H. Taminiau +2

The advancement and scaling of quantum technology has made the learning and identification of quantum systems and devices in highly-multidimensional parameter spaces a pressing tas…

quant-ph2025★ 6 cited

Spin-Photon Correlations from a Purcell-enhanced Diamond Nitrogen-Vacancy Center Coupled to an Open Microcavity

Julius Fischer, Yanik Herrmann, Cornelis F. J. Wolfs +3

An efficient interface between a spin qubit and single photons is a key enabling system for quantum science and technology. We report on a coherently controlled diamond nitrogen-va…

Laser-cut Patterned, Micrometer-thin Diamond Membranes with Coherent Color Centers for Open Microcavities

Yanik Herrmann, Julia M. Brevoord, Julius Fischer +10

Micrometer-scale thin diamond devices are key components for various quantum sensing and networking experiments, including the integration of color centers into optical microcaviti…

Qymera: Simulating Quantum Circuits using RDBMS

Tim Littau, Rihan Hai

Quantum circuit simulation is crucial for quantum computing such as validating quantum algorithms. We present Qymera, a system that repurposes relational database management system…

Trans-dimensional Hamiltonian model selection and parameter estimation from sparse, noisy data

Abigail N. Poteshman, Jiwon Yun, Tim H. Taminiau +1

High-throughput characterization often requires estimating parameters and model dimension from experimental data of limited quantity and quality. Such data may result in an ill-pos…