11 papers
TRACE: Temporal Risk Assessment and Concept Editing for Safer Language Generation
Ankur Garg, Xuemin Yu, Hassan Sajjad +1
Large language models (LLMs) can produce harmful content while generating a response. A useful safeguard should not only detect this risk during generation but also intervene while…
Ordering controlled by the measurement-feedback interval in quantum Boltzmann samplers
Peng Wang, Yu-Xuan Zhang, Hai-Tao Ding +1
We show that the measurement--feedback interval alone can induce ordering in a quantum Boltzmann sampler with fixed programmed couplings and a fixed local dissipative rule. At zero…
The Quantum Hamming Bound in Arbitrary Local Dimension
Yu-Xuan Zhang, Jing-Ling Chen
The quantum Hamming bound arises from a direct dimension estimate for exact quantum error-correcting codes. For nondegenerate codes, distinct correctable errors map the code space…
Degeneracy Cannot Violate the Quantum Hamming Bound
Yu-Xuan Zhang, Jing-Ling Chen
The quantum Hamming bound is the standard finite-length sphere-packing bound for exact correction of arbitrary qubit errors. Whether degeneracy can evade this bound has remained un…
Every Rank-2 Bipartite Entangled State is Projectively Steerable
Yu-Xuan Zhang, Jing-Ling Chen
We prove that every rank-2 bipartite entangled state is already steerable with projective measurements, closing the first possible gap between entanglement and Einstein-Podolsky-Ro…
Exact SU(2) Yang-Mills Waves from a Simple Ansatz
Yu-Xuan Zhang, Jing-Ling Chen
We propose a simple ansatz that reduces the sourceless SU(2) Yang--Mills equations in (3+1) dimensions to nine algebraic constraints. Solving these constraints yields three closed-…
Boundary Geometry Turns Entanglement into Steering
Yu-Xuan Zhang, Jing-Ling Chen
Quantum entanglement does not necessarily imply Einstein-Podolsky-Rosen steering. We identify a \emph{boundary mechanism} that closes this gap when an entangled state meets the bou…
Exact Solutions of the SU(2) Yang-Mills Equations from a Static Ansatz
Yu-Xuan Zhang, Jing-Ling Chen
We present a systematic study of static solutions to the source-free SU(2) Yang-Mills equations, in which the gauge potential explicitly depends on spin operators. By employing the…
Peres-type Criterion of Einstein-Podolsky-Rosen Steering for Two Qubits
Yu-Xuan Zhang, Jing-Ling Chen
Quantum nonlocality manifests in multipartite systems through entanglement, Bell's nonlocality, and Einstein-Podolsky-Rosen (EPR) steering. While Peres's positive-partial-transpose…
Steerability of Rank-2 Two-Qubit Entangled States
Yu-Xuan Zhang, Jing-Ling Chen
Quantum nonlocality is an essential resource in quantum information and is commonly classified into three distinct forms: quantum entanglement, Einstein-Podolsky-Rosen (EPR) steeri…
Exactly Solvable Quantum Model with Spin-Dependent Coulomb Interaction
Jiang-Lin Zhou, Yu-Xuan Zhang, Choo Hiap Oh +1
In this work, we report an exactly solvable quantum model featuring a spin-dependent Coulomb interaction, described by the spin vector potential \(\vec{\mathcal{A}} = k (\vec{r} \t…