Finite-blockade dynamics of a three-qubit ccz gate in neutral-atom arraysWe present a theoretical study of finite-blockade dynamics in a symmetric three-neutral-atom system, providing a framework for understanding high-fidelity multiqubit quantum operations. The…Paramjeet Banger, Ajay Wasan·Sep 10, 2026SaveLearn
Optimal T-Count for Block Encodings of Fermionic and Spin HamiltoniansWe determine the non-Clifford T-gate cost of constructing block encodings of structured fermionic and spin Hamiltonians in a unitary Clifford+T model, when arbitrarily many clean ancillas and…Jiaxin Ma, Kevin J. Joven, Yuan Liu·Sep 10, 2026SaveLearn
Bargmann Invariants Are Insufficient for Complete Local-Unitary Orbit DiscriminationBargmann invariants constructed from a bipartite density operator and its two lifted marginals are polynomial invariants of local-unitary conjugation. We determine the precise information encoded in…Lin Zhang, Bing Xie·Sep 10, 2026SaveLearn
Coherent Floquet quantum reservoirs for molecular property predictionQuantum reservoir computing (QRC) uses quantum dynamics to represent input histories for prediction through a trained classical readout. Discrete time crystals (DTCs) exhibit robust subharmonic…Luofei Wang, Da Zhang, Congren Wang et al.·Sep 10, 2026SaveLearn
Engineered two-photon dissipative confinement of a Kerr-cat qubit using SISIS quantum circuit refrigeratorKerr-cat qubits realized in periodically driven superconducting nonlinear resonators are a promising platform for quantum information processing with biased noise. Pure dephasing in such systems…Shumpei Masuda, Tsuyoshi Yamamoto, Shuji Nakamura et al.·Sep 10, 2026SaveLearn
Full-Rank Noise Forbids Long-Range Entanglement SwappingQuantum repeaters extend entanglement by swapping noisy elementary links. We prove that full-rank noise forbids this at long range: for any entangled full-rank two-qubit link, there is a finite depth…Xuan Du Trinh, Nicholas Pardave, Angie Huang et al.·Sep 10, 2026SaveLearn
On-chip squeezed light in the audio frequency bandSqueezed light in the audio-frequency band is a key resource for quantum metrology and quantum sensing. However, realizing stable audio-frequency squeezed light on integrated photonic platforms…Xuezhi Zhu, Yunyun Cao, Rui Liu et al.·Sep 10, 2026SaveLearn
Full Inseparability and Genuine Multipartite Entanglement Coincide for Finite-Mode Gaussian StatesFor general mixed states, entanglement across every bipartition need not imply genuine multipartite entanglement (GME), because a biseparable decomposition may switch the separable cut from term to…Yu Yang, Yuhang Wang, Chunxiao Du et al.·Sep 10, 2026SaveLearn
Sample-optimal learning of stabilizer statesIt is well-known that learning a pure n-qubit stabilizer state |ψ both requires, and can be accomplished with, access to a number of copies of |ψ linear in n. However, the…Rebecca Chang, Matthias C. Caro, Martin Larocca et al.·Sep 10, 2026SaveLearn
Low-cost algorithm-to-execution framework for surface-code quantum computingThe execution of useful quantum algorithms on fault-tolerant processors requires more than a mapping from logical gates to encoded operations: the spatial organization, non-Clifford resource supply,…Yunxin Tang, Zixuan Huo, Junxiang Huang et al.·Sep 10, 2026SaveLearn
Distributed variational quantum computing with deterministic entanglement tuningDistributed quantum computing offers a scalable route to quantum information processing by entangling spatially separated processors. Although gate teleportation enables universal computation across…Ilhwan Kim, Yong-Su Kim, Kwang Jo Lee et al.·Sep 10, 2026SaveLearn
Probing the Error-Mitigation Threshold with Matrix Product StatesQuantum error mitigation relies on accurate noise characterization, but mismatches between the actual and characterized noise can be amplified and drive a sharp threshold between successful and…Jia-Yao Zhao, Zhi-Yuan Wei, Michael J. Gullans·Sep 10, 2026SaveLearn
Coded Clifford Measurements for Multiqubit Magic-State CultivationMagic-state cultivation suppresses errors by measuring logical Clifford checks and discarding inconsistent outcomes. For an entangled resource, several measurement branches are usable, so their…Gunsik Min, Jun Heo·Sep 10, 2026SaveLearn
Direct Cultivation of Entangled |CS Magic StatesMagic-state cultivation has so far focused mainly on single-qubit non-Clifford resources. We develop a direct cultivation architecture for the entangled state |CS=CS|++. Two commuting…Gunsik Min, Jun Heo·Sep 10, 2026SaveLearn
Threshold Behavior of ZX and ZY Surface Codes Under Circuit-Level Biased and Crosstalk NoiseStudying the threshold behavior of surface codes under biased noise models is an active area of research. Previous work Tuckett et al. (2018), using an optimal tensor-network decoder, demonstrated…Pritesh Thakur, Jean-François Van Huele·Sep 9, 2026SaveLearn
The Quantum Overlap Gap Property and Algorithmic Hardness for the Quantum Hypergraph Max-Cut ProblemIn this work, we analyze the average-case hardness of approximation for the Quantum Hypergraph Max-Cut problem using the theoretical framework of the Quantum Overlap Gap Property (QOGP). We establish…Mikhail Mints, Eric R. Anschuetz·Sep 9, 2026SaveLearn
Programmable CMOS DAC Operating in Cryogenic Environments for Controlling Superconducting QubitsThis paper presents the design and test results of a CMOS current-based Digital to Analog Converter (DAC) that operates at cryogenic temperatures and that can be used to precisely control the amount…A. Pelteku, D. Reitz, M. Covington et al.·Sep 9, 2026SaveLearn
Tight Time-Space Lower Bounds for Collision Finding and Element Distinctness under Label SymmetryHow much memory is needed to retain the quantum speedup for collision finding? For a uniformly random function f:[N] [N], the BHT algorithm finds a collision using O(N1/3) queries and a…Frédéric Magniez, Sebastian Zur·Sep 9, 2026SaveLearn
A Quantum-Inspired Dequantization Method for Diagonally Weighted Matrix Functions: Application to Learning with Optimized Random FeaturesQuantum-inspired classical algorithms have dequantized several quantum machine learning routines by replacing quantum linear-algebra subroutines with classical counterparts. However, the sampler…Natsuto Isogai, Mio Murao, Hayata Yamasaki·Sep 9, 2026SaveLearn
Perfect (s,r)-state transferMuch work has been done in the last two decades on the topic of quantum state transfer in a quantum spin network. One can model such a system of interacting qubits using an undirected graph, and…Stephen Kirkland, Hermie Monterde, Sarah Plosker·Sep 9, 2026SaveLearn
Demonstration of a logical Bell-state measurement beyond the linear-optical limitFault tolerance is essential for scalable quantum technologies and is enabled by quantum error-correction codes. Bell-state measurements (BSMs) are a fundamental building block for modern quantum…Shreya Kumar, Simon D. Reiß, Peter van Loock et al.·Sep 9, 2026SaveLearn
Differential and Common Decoherence Modes in Witnessing the Quantum Gravity-Induced Entanglement of MatterIn the context of the QGEM (Quantum Gravity-induced Entanglement of Masses) experiment, we consider two adjacent matter-wave interferometers in linear and parallel configurations that interact solely…Ryan Rizaldy, Helen M Sheehy, Tian Zhou et al.·Sep 9, 2026SaveLearn
Floquet Majorana XYZ Codes with Tunable Logical DynamicsWe construct Floquet codes from the Majorana XYZ subsystem code with local realizations both in qubits and directly in microscopic Majorana modes with lattice size L× L. For a three-step…Xinyu Sun, Hong Yao·Sep 9, 2026SaveLearn
Krylov Edge Spectroscopy of Symmetry-Protected Topological PhasesWe introduce Krylov edge spectroscopy, a many-body operator-space protocol for detecting and classifying one-dimensional symmetry-protected topological phases from local boundary dynamics. A…Heiko Georg Menzler, Rishabh Jha·Sep 9, 2026SaveLearn
Walking Floquet code circuits for zero-overhead leakage reductionLeakage, occurring when a qubit undetectably exits the computational subspace, poses a significant challenge for quantum error correction by inducing correlated errors in space and time. These…Hanna Westerheim, Kaavya Sahay, Shruti Puri·Sep 9, 2026SaveLearn