Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Measurement-induced cubic phase state generation
Harsh Kashyap, Denis A. Kopylov, Polina R. Sharapova·Jul 29, 2025
The cubic phase state constitutes a nonlinear resource that is essential for universal quantum computing protocols. However, constructing such non-classical states faces many challenges. In this work, we present a protocol for generating a cubic phas...
Static and Dynamical Characterization of Ground State Phases Induced by Frustration and Magnetic Field in the Spin-1 Orthogonal Dimer Chain
E. Ong, D. Bhowmick, Sharoz Schezwen +1 more·Jul 29, 2025
The spin-$1$ orthogonal dimer chain is investigated using the Density Matrix Renormalization Group (DMRG) algorithm. A transformation to a basis that uses the local eigenstates of the orthogonal dimers, while retaining the local spin states for the p...
On primordial matter production induced by spatial curvature in the early universe
V. E. Kuzmichev, V. V. Kuzmichev·Jul 28, 2025
In this note, it is shown that nonvanishing spatial curvature produces primordial matter in the initially empty universe due to quantum gravity effects. This matter decays faster than radiation and is described by a stiff equation of state. The quant...
Circuit simulation of readout process toward large-scale superconducting quantum circuits
T. Tanamoto, Hiroshi Fuketa, T. Ishikawa +1 more·Jul 27, 2025
The rapid scaling of superconducting quantum computers has highlighted the impact of device-level variability on overall circuit fidelity. In particular, fabrication-induced fluctuations in device parameters such as capacitance and Josephson critical...
Almost fault-tolerant quantum machine learning with drastic overhead reduction
Haiyue Kang, Younghun Kim, Eromanga Adermann +2 more·Jul 25, 2025
Errors in the current generation of quantum processors pose a significant challenge towards practical-scale implementations of quantum machine learning (QML) as they lead to trainability issues arising from noise-induced barren plateaus, as well as p...
Programmable exploration of magnetic states in Lieb-kagome interpolated lattices
A. Lopez-Bezanilla, Pavel A. Dub, Avadh Saxena·Jul 24, 2025
We investigate a hybrid modeling framework in which a quantum annealer is used to simulate magnetic interactions in molecular qubit lattices inspired by experimentally realizable systems. Using phthalocyanine assemblies as a structurally constrained ...
Spectator Leakage Elimination in CZ Gates via Tunable Coupler Interference on a Superconducting Quantum Processor
Peng Wang, Bing-Han Lu, Tian-Le Wang +11 more·Jul 19, 2025
Spectator-induced leakage poses a fundamental challenge to scalable quantum computing, particularly as frequency collisions become unavoidable in multi-qubit processors. We introduce a leakage mitigation strategy based on dynamically reshaping the sy...
Fast charge noise sensing using a spectator valley state in a singlet-triplet qubit
David W. Kanaar, Yasuo Oda, M. Gyure +1 more·Jul 18, 2025
Semiconductor spin qubits are a promising platform for quantum computing but remain vulnerable to charge noise. Accurate, in situ measurement of charge noise could enable closed-loop control and improve qubit performance. Here, we propose a method fo...
Phase shadow: A noise-tolerant path to global quantum property estimation
Qingyue Zhang, Dayue Qin, Zhou You +3 more·Jul 17, 2025
Measuring global quantum properties-such as the fidelity to complex multipartite states-is both an essential and experimentally challenging task. Classical shadow estimation offers favorable sample complexity, but typically relies on many-qubit circu...
Scalable suppression of heating errors in large trapped-ion quantum processors
Zixuan Huo, Yangchao Shen, Xiao Yuan +1 more·Jul 17, 2025
Trapped-ion processors are leading candidates for scalable quantum computation. However, motional heating remains a key obstacle to fault-tolerant operation, especially when system size increases. Heating error is particularly challenging to suppress...
Simultaneous High-Fidelity Single-Qubit Gates in a Spin Qubit Array
Yi-Hsien Wu, L. Camenzind, Patrick Butler +8 more·Jul 16, 2025
Silicon spin qubits are a promising platform for scalable quantum computing due to their compatibility with industrial semiconductor fabrication and the recent scaling to multi-qubit devices. Control fidelities above the 99% fault-tolerant threshold ...
Design Automation in Quantum Error Correction
Archisman Ghosh, Avimita Chatterjee, Swaroop Ghosh·Jul 16, 2025
Quantum error correction (QEC) underpins practical fault-tolerant quantum computing (FTQC) by addressing the fragility of quantum states and mitigating decoherence-induced errors. As quantum devices scale, integrating robust QEC protocols is imperati...
Universal scaling of microwave dissipation in superconducting circuits
Thibault Charpentier, Anton Khvalyuk, Lev Ioffe +3 more·Jul 11, 2025
Improving the coherence of superconducting qubits is essential for advancing quantum technologies. While superconductors are theoretically perfect conductors, they consistently exhibit residual energy dissipation when driven by microwave currents, li...
Improving Transmon Qubit Performance with Fluorine-based Surface Treatments
Michael Gingras, B. Niedzielski, K. Grossklaus +21 more·Jul 10, 2025
Reducing materials and processing-induced decoherence is critical to the development of utility-scale quantum processors based on superconducting qubits. Here we report on the impact of two fluorine-based wet etches, which we use to treat the silicon...
Flexible Readout and Unconditional Reset for Superconducting Multiqubit Processors with Tunable Purcell Filters.
Yongxi Xiao, Da'er Feng, Xuemei Gu +18 more·Jul 9, 2025
Achieving high-fidelity qubit readout and reset while maintaining qubit coherence is crucial for quantum error correction and advanced quantum algorithms. Here, we design and experimentally demonstrate a scalable architecture based on frequency-tunab...
A Conservative Theory of Semiclassical Gravity
Francisco Pipa·Jul 7, 2025
We argue that semiclassical gravity can be made consistent if quantum systems source gravity only when they participate in non-gravitational interactions that lead to environment-induced decoherence. Outside such decoherence-based events, systems do ...
Characterization of drive-induced unwanted state transitions in superconducting circuits
W. Dai, S. Hazra, D. K. Weiss +11 more·Jun 30, 2025
Microwave drives are essential for implementing control and readout operations in superconducting quantum circuits. However, increasing the drive strength eventually leads to unwanted state transitions which limit the speed and fidelity of such opera...
Quantum state transfer and periodicity in discrete-time quantum walks under non--Markovian dephasing noise
Monika Rani, Supriyo Dutta, Subhashish Banerjee·Jun 30, 2025
In quantum communication, quantum state transfer from one location to another in a quantum network plays a prominent role, where the impact of noise could be crucial. The idea of state transfer can be fruitfully associated with quantum walk on graphs...
Robust Tripartite Entanglement Generation via Correlated Noise in Spin Qubits
Sander Driessen, Ji Zou, Even Thingstad +2 more·Jun 25, 2025
We investigate the generation of genuine tripartite entanglement in a triangular spin-qubit system due to spatially correlated noise. In particular, we demonstrate how the formation of a highly entangled dark state -- a W state -- enables robust, lon...
Variational simulation of quantum phase transitions induced by boundary fields
Alan C. Duriez, A. Saguia, M. S. Sarandy·Jun 25, 2025
The characterization of quantum phase transitions is a fundamental task for the understanding of quantum phases of matter, with a number of potential applications in quantum technologies. In this work, we use digital quantum simulation as a resource ...