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arXiv:2611.05561v1 Announce Type: new Abstract: Accurate characterization of quantum dynamics is essential for the calibration and control of quantum devices. Unknown state preparation and measurement (SPAM) errors, however, introduce gauge ambiguities that limit what can be learned.
arXiv QuantumRead article →arXiv:2611.05541v1 Announce Type: new Abstract: Defining entropy of a quantum channel has become a challenge with potential candidates recently reported in literature. In this Article, it is taken under consideration the entropy of a quantum channel defined as the quantum entropy of its associated Choi state. The consequences presented here of such approach is two-fold.
arXiv QuantumRead article →arXiv:2611.05537v1 Announce Type: new Abstract: The Lindblad master equation is the standard framework for describing dissipative dynamics of the open quantum system context. Its conventional derivation, however, relies on the rotating-wave approximation (RWA), which neglects the counter rotating terms in the system-reservoir interaction.
arXiv QuantumRead article →arXiv:2611.05526v1 Announce Type: new Abstract: Building on aspects of a recent diagrammatic field-theory programme for quantum error correction put forward by the first-named author (arXiv:2607.08911), we construct exact finite-dimensional codes from twisted cyclic and argyle quiver moduli on the projective line.
arXiv QuantumRead article →arXiv:2611.05509v1 Announce Type: new Abstract: Device-independent conference key agreement (DI-CKA) allows a group of users to establish a common secret key without trusting the internal operation of their quantum devices. Existing DI-CKA protocols derive their security from multipartite Bell tests and therefore require the device components not to communicate during each round.
arXiv QuantumRead article →arXiv:2611.05502v1 Announce Type: new Abstract: We characterize the complexity of space-time correlated decoding for fault-tolerant quantum computing architectures that implement Clifford gates transversally and realize non-Clifford gates via magic state injection.
arXiv QuantumRead article →arXiv:2611.05499v1 Announce Type: new Abstract: Quantum mechanics is inherently geometric in that the pure states form a curved complex manifold and the Schr\"odinger evolution defines a Hamiltonian flow on this space. Geometry identifies constraints on flows on quantum state-space that hold independently of their microscopic realization.
arXiv QuantumRead article →arXiv:2611.05497v1 Announce Type: new Abstract: Entanglement swapping entangles photons that never interacted directly. When implemented with linear optics, its success probability is upper bounded by $50\%$, due to the limited efficiency of linear-optical Bell-state measurements.
arXiv QuantumRead article →arXiv:2611.05495v1 Announce Type: new Abstract: Quantum dynamics in Krylov space can be represented by a particle hopping on a chain whose sites are the Krylov basis vectors. The goal of this work is to extend this idea to the Fock basis, which in turn allows the description of a generic dynamics in terms of a more general, possibly higher-dimensional lattice.
arXiv QuantumRead article →arXiv:2611.05483v1 Announce Type: new Abstract: Instantaneous quantum polynomial-time (IQP) Born machines are attractive quantum generative models, as certain IQP circuit families are conjectured to be hard to sample, yet they can be trained classically. Previously proposed conditional IQP Born machines make the parameters of the diagonal layer condition dependent.
arXiv QuantumRead article →arXiv:2611.05481v1 Announce Type: new Abstract: NISQ devices routinely estimate properties of the noiseless system from measurements at varying noise strengths $\gamma$. These zero-noise extrapolation (ZNE) schemes fail to estimate transport coefficients of conserved quantities when the noise violates the associated conservation laws.
arXiv QuantumRead article →arXiv:2611.05479v1 Announce Type: new Abstract: For Haar-random quantum states, measurement probabilities follow the universal Porter--Thomas distribution. This implies anticoncentration, i.e.\ the spreading of probability over exponentially many outcomes, a key property underlying random-circuit-sampling experiments.
arXiv QuantumRead article →arXiv:2611.05471v1 Announce Type: new Abstract: Noise typically destroys quantum coherence and washes out transport phenomena that rely on interference. Chiral quantum walks are a case in point: a particle hopping on a lattice threaded by a magnetic flux can spread asymmetrically due to interference between paths, an asymmetry that noise is expected to erase.
arXiv QuantumRead article →arXiv:2611.05466v1 Announce Type: new Abstract: Neutron scattering is a central probe of quantum materials, yet what quantum information can, in principle, be extracted from a scattering experiment remains unclear. Here we formulate neutron scattering as a quantum measurement, with the scattering amplitudes acting as Kraus operators on the material state.
arXiv QuantumRead article →arXiv:2611.05462v1 Announce Type: new Abstract: Quantum speed limits bound the time required for a given state to evolve into a given subspace of the Hilbert space under specific energy constraints. We prove that for several standard orthogonalization time bounds, the unique spectral measure associated with the initial vector that saturates the bound is a sum of two Dirac measures.
arXiv QuantumRead article →arXiv:2611.05460v1 Announce Type: new Abstract: Strong light-matter interactions are central to state-of-the-art quantum technologies, spanning platforms as diverse as Rydberg atoms, trapped ions, and superconducting circuits. In superconducting circuits, the strong dispersive coupling between microwave photons (light) and ancillary qubits (matter) has enabled universal bosonic control and quantum error correction.
arXiv QuantumRead article →arXiv:2610.34824v2 Announce Type: replace Abstract: LLMs on edge devices are constrained by limited memory and bandwidth. Although 1.58-bit ternary weights greatly reduce model storage, long-context inference is increasingly bottlenecked by KV-cache traffic and attention. Existing accelerators also use separate datapaths for ternary linear layers and attention, incurring hardware and execution overhead.
arXiv Computer Science ARRead article →arXiv:2610.13368v2 Announce Type: replace Abstract: Ising machines solve combinatorial optimization problems by annealing a network of spins. On dense problems, the least expensive hardware step updates all spins at once: stochastic cellular automata (SCA) decide every spin in parallel and read couplings only for the spins that flip.
arXiv Computer Science ARRead article →arXiv:2607.08407v3 Announce Type: replace Abstract: The rising pressure on DRAM availability and contract pricing reflects generative AI's massive high-performance memory requirements. This pressure is heavily compounded by hyperscale data center expansion, which now consumes a significant portion of global DRAM output.
arXiv Computer Science ARRead article →arXiv:2607.04031v2 Announce Type: replace Abstract: Large Language Model (LLM) inference is bottlenecked by the capacity and bandwidth of GPU High-Bandwidth Memory (HBM). Recent proposals, such as High-Bandwidth Flash (HBF) and RoMe, offer higher capacity or bandwidth than HBM, but require a minimum access granularity of kilobytes.
arXiv Computer Science ARRead article →arXiv:2611.06491v1 Announce Type: cross Abstract: Short-interval wireless schedulers must return a complete, feasible beam-and-resource allocation before each execution deadline, and a late or invalid output gives no utility in the current control cycle. Searching longer can increase transmitted traffic, but it may also miss the deadline or leave only an infeasible intermediate solution.
arXiv Computer Science ARRead article →arXiv:2611.06079v1 Announce Type: cross Abstract: Statically scheduled accelerators such as Groq's Tensor Streaming Processor (TSP) achieve low-latency large language model inference by stripping dynamic synchronization hardware from the chip.
arXiv Computer Science ARRead article →arXiv:2611.06036v1 Announce Type: cross Abstract: Processing-in-Memory places small programmable cores on the memory device, where they execute beside the DRAM banks and beyond the control-flow defenses that protect host programs. The security of this in-memory code is an attack surface that remains largely unstudied.
arXiv Computer Science ARRead article →arXiv:2611.05906v1 Announce Type: cross Abstract: As sequence lengths continue to grow, distributed attention based on sequence parallel (e.g., Ring-Attention) has become a mainstream solution for large language models (LLMs). Nevertheless, inherent communication dependencies limit computation-communication overlap, reducing GPU utilization.
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