Papers
Non-Unitary Quantum Machine Learning: Fisher Efficiency Transitions from Distributed Quantum Expressivity
Apoorv Kumar Masta, Srinjoy Ganguly, Shalini Devendrababu +3 more·Mar 28, 2026
Quantum machine learning has faced growing scrutiny over its practical advantages compared to classical approaches, particularly following dequantization results and large scale benchmarking studies that have challenged earlier optimistic claims. Thi...
NNQA: Neural-Native Quantum Arithmetic for End-to-End Polynomial Synthesis
Ziqing Guo, Jie Li, Yong Chen +1 more·Mar 28, 2026
Hybrid classical quantum learning is often bottlenecked by communication overhead and approximation error from generic variational ansatzes. In this study, we introduce Neural Native Quantum Arithmetic (NNQA), which compiles classically learned nonli...
Ultralow-power coherent qubit control using AQFP logic at millikelvin temperatures
Hiroto Mukai, Akiyoshi Tomonaga, Rui Wang +5 more·Mar 28, 2026
Qubit controllers are essential for scaling superconducting quantum processors, but implementing them at the 10 mK stage of a dilution refrigerator remains challenging due to stringent cooling constraints. Here we report an ultralow-power qubit contr...
Majorana-XYZ subsystem code
Tobias Busse, Lauri Toikka·Mar 27, 2026
We present a new type of a quantum error correction code, termed Majorana-XYZ code, where the logical quantum information scales macroscopically yet is protected by topologically non-trivial degrees of freedom. It is a $[n,k,g,d]$ subsystem code with...
Decomposition of Multi-Qubit Gates for Circuit Cutting
Ryota Tamura, Tomoya Kashimata, Yohei Hamakawa +2 more·Mar 27, 2026
A large-scale quantum circuit can be partitioned into multiple subcircuits through circuit cutting, where each subcircuit is executed multiple times and the expectation value of the original circuit is reconstructed by classical post-processing from ...
MoSAIC: Scalable Probabilistic Error Cancellation via Variational Blockwise Noise Aggregation
Maya Ma, Rimika Jaiswal, Murphy Yuezhen Niu·Mar 27, 2026
Quantum error mitigation is essential for extracting trustworthy results from noisy intermediate-scale quantum (NISQ) processors. Yet, current approaches face a core scalability bottleneck: unbiased methods such as probabilistic error cancellation (P...
Scalable topological quantum computing based on Sine-Cosine chain models
A. Lykholat, G. F. Moreira, I. R. Martins +3 more·Mar 26, 2026
This work proposes a scalable framework for topological quantum computing using Matryoshka-type Sine-Cosine chains. These chains support high-dimensional qudit encoding within single systems, reducing the physical resource overhead compared to conven...
Weighted Nested Commutators for Scalable Counterdiabatic State Preparation
Jialiang Tang, Xi Chen, Zhi-Yuan Wei·Mar 26, 2026
Counterdiabatic (CD) driving enables efficient quantum state preparation, but it requires implementing highly nonlocal adiabatic gauge potentials (AGP) that are impractical to compute and realize in large many-body systems. We introduce a \textit{wei...
Kardashev scale Quantum Computing for Bitcoin Mining
Pierre-Luc Dallaire-Demers, BTQ Technologies Team·Mar 26, 2026
Bitcoin already faces a quantum threat through Shor attacks on elliptic-curve signatures. This paper isolates the other component that public discussion often conflates with it: mining. Grover's algorithm halves the exponent of brute-force search, pr...
Maximizing Qubit Throughput under Buffer Decoherence and Variability in Generation
Padma Priyanka, Avhishek Chatterjee, Sheetal Kalyani·Mar 26, 2026
Quantum communication networks require transmission of high-fidelity, uncoded qubits for applications such as entanglement distribution and quantum key distribution. However, current implementations are constrained by limited buffer capacity and qubi...
A counterexample to the strong spin alignment conjecture
Zhiwei Song, Lin Chen·Mar 26, 2026
The spin alignment conjecture was originally formulated in connection with the additivity of coherent information for a class of quantum channels known as platypus channels. Recently, a stronger majorization-based version was proposed by M. A. Alhejj...
The 27-qubit Counterexample to the LU-LC Conjecture is Minimal
Nathan Claudet·Mar 26, 2026
It was once conjectured that two graph states are local unitary (LU) equivalent if and only if they are local Clifford (LC) equivalent. This so-called LU-LC conjecture was disproved in 2007, as a pair of 27-qubit graph states that are LU-equivalent, ...
T Count as a Numerically Solvable Minimization Problem
Marc Grau Davis, Ed Younis, Mathias Weiden +2 more·Mar 26, 2026
We present a formulation of the problem of finding the smallest T -Count circuit that implements a given unitary as a binary search over a sequence of continuous minimization problems, and demonstrate that these problems are numerically solvable in p...
The Pareto Frontiers of Magic and Entanglement: The Case of Two Qubits
Alexander Roman, Marco Knipfer, Jogi Suda Neto +3 more·Mar 26, 2026
Magic and entanglement are two measures that are widely used to characterize quantum resources. We study the interplay between magic and entanglement in two-qubit systems, focusing on the two extremes: maximal magic and minimal magic for a given leve...
Flagging the Clifford hierarchy:~Fault-tolerant logical $\fracπ{2^l}$ rotations via measuring circuit gauge operators of non-Cliffords
Shival Dasu, Ben Criger·Mar 25, 2026
We provide a recursively defined sequence of flag circuits which will detect logical errors induced by non-fault-tolerant $R_{\overline{Z}}(\fracπ{2^l})$ gates on CSS codes with a fault distance of two. As applications, we give a family of circuits w...
Time-frequency Talbot effect as Clifford operations on entangled time-frequency GKP states
Thomas Pousset, Romain Dalidet, Laurent Labonté +1 more·Mar 25, 2026
The Talbot effect -- a near-field diffraction phenomenon in which a periodic wavefront self-images at regular distances -- can be transposed to the time--frequency domain via the space--time duality between diffraction and dispersive broadening. We e...
Mitigating Dynamic Crosstalk with Optimal Control
Matthias G. Krauss, Luise C. Butzke, Christiane P. Koch·Mar 25, 2026
The prevalence of quantum crosstalk is an important barrier to scaling frequency-addressable qubit architectures, with dynamic crosstalk being particularly difficult to detect and suppress. This form of crosstalk refers to unintended interactions dri...
Efficient Many-Body Shadow Metrology via Clifford Lensing
Sooryansh Asthana, Conan Alexander, Anubhav Kumar Srivastava +2 more·Mar 25, 2026
Quantum probes that enable enhanced exploration and characterization of complex systems are central to modern science, spanning applications from biology to astrophysics and chemical design. In large many-body quantum systems, interactions delocalize...
Quantum Computing and Error Mitigation with Deep Learning for Frenkel Excitons
Yi-Ting Lee, Vijaya Begum-Hudde, Barbara A. Jones +1 more·Mar 25, 2026
Quantum computers, currently in the noisy intermediate-scale quantum (NISQ) era, have started to provide scientists with a novel tool to explore quantum physics and chemistry. While several electronic systems have been extensively studied, Frenkel ex...
Efficient Preparation of Graph States using the Quotient-Augmented Strong Split Tree
Nicholas Connolly, Shin Nishio, Dan E. Browne +2 more·Mar 25, 2026
Graph states are a key resource for measurement-based quantum computation and quantum networking, but state-preparation costs limit their practical use. Graph states related by local complement (LC) operations are equivalent up to single-qubit Cliffo...