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Quantum Physics Papers

@QuantumPapers · Worldwide · joined 24 Apr 2010

New Quantum Physics papers from https://t.co/erpaXV7auL: quantum physics. Thank you to arXiv for use of its open access interoperability.

15 566Followers
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Neueste Beiträge

Quantum Physics Papers@QuantumPapers
Where to Decide: Control-Plane Geometry in Coherence-Limited Quantum Networks I. Dey, N. Marchetti https://t.co/gFQqjZct9X [𝚚𝚞𝚊𝚗𝚝-𝚙𝚑] https://t.co/l2MYGerqLi
Quantum networks are usually framed by two hardware limits: how fast entanglement can be heralded, and how long a memory can hold it. We establish a third, geometric limit: entanglement decoheres while control information travels, so the distance to whoever allocates resources enters the fidelity budget directly. We develop a functional-graph abstraction weighting each link by its predicted multiplicative contribution to end-to-end fidelity, separating global but delayed state from local and immediate state, and compare centralized against local allocation in a replicated discrete-event model. Centralized delivery latency grows with network diameter while local latency is nearly scale invariant, differing up to twenty-fold for short-range traffic; the coherence threshold at which a global view outweighs a fresh one does not shift across the tested sizes; and as heralding accelerates, the dominant cost moves into the control plane. Slot synchronization instead obeys the product of slot
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Quantum Physics Papers@QuantumPapers
Universality in Terms of The BECs Bloch-Sphere Manipulations Genji Fujii https://t.co/P9zT8kv75X [𝚚𝚞𝚊𝚗𝚝-𝚙𝚑] https://t.co/fQqwFu46sA
Quantum computing promises to outperform classical computing for certain computational tasks. One of the key concepts underlying this potential is universality. Universality has been extensively studied not only for qubits but also for higher-dimensional quantum systems, such as qutrits and qudits, which span Hilbert spaces of dimension greater than two. However, the concept of universality in Bose-Einstein condensates (BECs) qubit systems, which have been proposed relatively recently, remains insufficiently understood. In this work, we analyzed universality in BECs qubit systems. Our results clarify the theoretical aspects of universality in quantum computation within the class of ((N+1))-dimensional representations of SU(2), taking into account two distinct representations of the quantum states.
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Quantum Physics Papers@QuantumPapers
The Requirement of (at least) Complex Structure for Quantum Mechanics M. P. Vaughan https://t.co/qXZtavcEIv [𝚚𝚞𝚊𝚗𝚝-𝚙𝚑 𝚙𝚑𝚢𝚜𝚒𝚌𝚜.𝚑𝚒𝚜𝚝-𝚙𝚑] https://t.co/RQB4P6WR0Q
It is argued that many real-valued constructions of quantum mechanics are only nominally real in that the operators and states are restricted to impose a complex structure on the Hilbert space. That is, complex algebra between pairs of elements representing complex numbers is preserved in these formulations. It is therefore mistaken to think of these constructions as being `real' as they are actually a representation of complex linear algebra. It is then shown that under the assumptions of state normalisation and strict energy conservation, this complex structure (at the very least) is required to allow for time evolution in quantum mechanics. This is only a minimum requirement, as our arguments do not preclude the formulation of quantum mechanics in terms of hyper-complex entities, such as quaternions.
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Quantum Physics Papers@QuantumPapers
An attainable Gill-Massar-type bound for spin-factor models Koichi Yamagata https://t.co/fdTxlJkik5 [𝚚𝚞𝚊𝚗𝚝-𝚙𝚑] https://t.co/gQsEJprGnC
We determine the exact local precision limits for single-copy estimation of smooth multiparameter quantum statistical models contained in spin factors, a class of matrix Jordan algebras whose state spaces generalize the qubit Bloch ball. At any parameter point where the symmetric logarithmic derivative (SLD) Fisher information is positive definite, we characterize the entire attainable classical Fisher-information region over all finite-outcome positive-operator-valued measurements. After SLD normalization, this region consists exactly of the real symmetric positive semidefinite matrices with trace at most one, independently of the ambient Hilbert-space dimension. This yields a sharp weighted covariance bound for every positive definite weight, attained by an explicit locally unbiased estimator based on randomized spectral measurements of SLD directions. The proof combines a statistics-preserving positive projection onto the spin factor with the two-eigenvalue structure of its effects,
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Quantum Physics Papers@QuantumPapers
Watching Quantum Models Think: Hilbert-Space Interpretability in Quantum Transformer Blocks Diego Iacopetta, Andrea Gasparini https://t.co/lPWTUlfC41 [𝚚𝚞𝚊𝚗𝚝-𝚙𝚑 𝚌𝚜.𝙰𝙸 𝚌𝚜.𝙻𝙶] https://t.co/om0r7BVoKd
Deep learning models are powerful but opaque. As quantum machine learning matures, the field faces a defining choice: build quantum models that are equally opaque, or exploit the mathematical structure of quantum mechanics to make them inherently interpretable. We show that the latter is possible. By tracking quantum mutual information (MI), entanglement entropy, and state fidelity through the layers of a Quantum Transformer Block (), a fully-coherent variational circuit with quantum analogues of both attention and feedforward, we gain direct insight into how the model processes information: which tokens it attends to, when correlations form, and why predictions fail. On four tasks with known dependency structure we show that (i) learned MI matrices align with ground-truth task structure (AUC = 0.69 on lookup), (ii) disabling entangling gates collapses accuracy from 100% to 15% while MI→ 0, proving entanglement is the mechanism, (iii) accuracy and MI co-evolve during training (ρ = 0.92
94 views · 1 likes · 0 reposts · 0 replies Open on X →

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9423 Sep
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48
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Last 5 collected posts, oldest on the left. The scale is logarithmic: one post can outrun the rest a hundred times over.

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1.75%
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Reactions — likes, reposts, replies and quotes — divided by views. Median for 10K–100K accounts is 1.52%.

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Share of every reaction we collected for this account. Replies mean argument, reposts mean endorsement, bookmarks mean the post was worth keeping.

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