Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Optomechanical quantum bus for donor spins in silicon
Henri Lyyra, Cliona Shakespeare, Simeoni Ahopelto +6 more·Mar 24, 2025
Silicon is the foundation of current information technology, and a promising platform for future quantum information technology as silicon-based qubits exhibit some of the longest coherence times in solid-state. At the same time, silicon is the under...
Criteria for unbiased estimation: applications to noise-agnostic sensing and learnability of quantum channel
Hyukgun Kwon, Kento Tsubouchi, Chia-Tung Chu +1 more·Mar 21, 2025
We establish the necessary and sufficient conditions for unbiased estimation in multi-parameter estimation tasks. More specifically, we first consider quantum state estimation, where multiple parameters are encoded in a quantum state, and derive simp...
Reducing T Gates with Unitary Synthesis
Tianyi Hao, Amanda Xu, Swamit Tannu·Mar 20, 2025
Quantum error correction is essential for achieving practical quantum computing but has a significant computational overhead. Among fault-tolerant (FT) gate operations, non-Clifford gates, such as $T$, are particularly expensive due to their reliance...
A Scalable and Robust Compilation Framework for Emitter-Photonic Graph State
Xiangyu Ren, Yuexun Huang, Zhiding Liang +1 more·Mar 20, 2025
Quantum graph states are critical resources for various quantum algorithms, and also determine essential interconnections in distributed quantum computing. There are two schemes for generating graph states - probabilistic scheme and deterministic sch...
The source of hardware-tailored codes and coding phases
Gaurav Gyawali, Henry Shackleton, Zhu-Xi Luo +1 more·Mar 19, 2025
A central challenge in quantum error correction is identifying powerful quantum codes tailored to specific hardware and determining their error thresholds above which quantum information is unprotected. This problem is hard because we cannot determin...
LuGo: an Enhanced Quantum Phase Estimation Implementation
Chao Lu, Muralikrishnan Gopalakrishanan Meena, Kalyana Chakravarthi Gottiparthi·Mar 19, 2025
Quantum Phase Estimation (QPE) is a cardinal algorithm in quantum computing that plays a crucial role in various applications, including cryptography, molecular simulation, and solving systems of linear equations. However, the standard implementation...
Provably optimal exact gate synthesis from a discrete gate set
'Elie Gouzien, N. Sangouard·Mar 19, 2025
We propose a method for exact circuit synthesis using a discrete gate set, as required for fault-tolerant quantum computing. Our approach translates the problem of synthesizing a gate specified by its unitary matrix into a boolean satisfiability (SAT...
Two-qubit logic and teleportation with mobile spin qubits in silicon
Y. Matsumoto, M. D. Smet, L. Tryputen +6 more·Mar 19, 2025
The scalability and power of quantum computing architectures depend critically on high-fidelity operations and robust and flexible qubit connectivity. In this respect, mobile qubits are particularly attractive as they enable dynamic and reconfigurabl...
Protected phase gate for the $0$-$π$ qubit using its internal modes
Xanda C Kolesnikow, Thomas B Smith, Felix Thomsen +2 more·Mar 18, 2025
Protected superconducting qubits such as the $0$-$π$ qubit promise to substantially reduce physical error rates. However, a key challenge in the field is designing gates for these qubits that do not compromise their protection, or become infeasibly s...
Scalable and fault-tolerant preparation of encoded k -uniform states
Shayan Majidy, Dominik Hangleiter, M. Gullans·Mar 18, 2025
$k$-uniform states are valuable resources in quantum information, enabling tasks such as teleportation, error correction, and accelerated quantum simulations. The practical realization of $k$-uniform states, at scale, faces major obstacles: verifying...
Data Encoding for VQC in Qiskit, A Comparison With Novel Hybrid Encoding
Hillol Biswas·Mar 18, 2025
If quantum machine learning emulates the ways of classical machine learning, data encoding in a quantum neural network is imperative for many reasons. One of the key ones is the complexity attributed to the data size depending upon the features and t...
Heuristic and Optimal Synthesis of CNOT and Clifford Circuits
Mark A. Webster, Stergios Koutsioumpas, Dan E. Browne·Mar 18, 2025
Efficiently implementing Clifford circuits is crucial for quantum error correction and quantum algorithms. Linear reversible circuits, equivalent to circuits composed of CNOT gates, have important applications in classical computing. In this work we ...
A mathematical model for a universal digital quantum computer with an application to the Grover-Rudolph algorithm
Antonio Falcó, Daniela Falcó--Pomares, Hermann G. Matthies·Mar 17, 2025
In this work, we develop a novel mathematical framework for universal digital quantum computation using algebraic probability theory. We rigorously define quantum circuits as finite sequences of elementary quantum gates and establish their role in im...
Low-Overhead Tailoring and Learning of Noise in Graph States
Guedong Park, Jinzhao Sun, Hyunseok Jeong·Mar 17, 2025
Graph and hypergraph states are important resource states for realizing universal quantum computation and diverse non-local physical phenomena. However, noise learning in such states is challenging due to their large entanglement and magic. This work...
Enhancing Circuit Trainability with Selective Gate Activation Strategy
Jeihee Cho, Junyong Lee, Daniel Justice +1 more·Mar 17, 2025
Hybrid quantum-classical computing relies heavily on Variational Quantum Algorithms (VQAs) to tackle challenges in diverse fields like quantum chemistry and machine learning. However, VQAs face a critical limitation: the balance between circuit train...
Realization of fermionic Laughlin state on a quantum processor
L. Shen, Mao Lin, Cedric Yen-Yu Lin +2 more·Mar 17, 2025
Strongly correlated topological phases of matter are central to modern condensed matter physics and quantum information technology but often challenging to probe and control in material systems. The experimental difficulty of accessing these phases h...
Cycle-Aware ZZ Crosstalk Mitigation on Quantum Hardware
Jiayi Zhong, Yuxin Deng·Mar 17, 2025
ZZ crosstalk and decoherence hinder superconducting quantum computing. To enhance parallelism in mitigating ZZ crosstalk, we formulate the problem by integrating quantum cycles and two forms of qubit interference. We then propose CYCO, a CYcle-aware ...
Optimizing the frequency positioning of tunable couplers in a circuit QED processor to mitigate spectator effects on quantum operations
S. Vall'es-Sanclemente, T. H. F. Vroomans, T. R. V. Abswoude +8 more·Mar 17, 2025
We experimentally optimize the frequency of flux-tunable couplers in a superconducting quantum processor to minimize the impact of spectator transmons during quantum operations (single-qubit gates, two-qubit gates and readout) on other transmons. We ...
Performance characterization of a multi-module quantum processor with static inter-chip couplers
G. Norris, Kieran Dalton, Dante Colao Zanuz +8 more·Mar 16, 2025
Three-dimensional integration technologies such as flip-chip bonding are a key prerequisite to realize large-scale superconducting quantum processors. Modular architectures, in which circuit elements are spread over multiple chips, can further im...
Robust Lindbladian Tomography for Cyclic Quantum Gates
T. Sugiyama·Mar 16, 2025
Precise characterization of noisy quantum operations plays an important role for realizing further accurate operations. Quantum tomography is a popular class of characterization methods, and several advanced methods in the class use error amplificati...