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arXiv:2611.04568v1 Announce Type: new Abstract: We study the entanglement dynamics of two qutrits under collective dephasing for a family of states obtained by mixing a maximally entangled state that lives in the decoherence-free subspace with three nonstationary two-term states sharing a common amplitude ratio $r$.
arXiv QuantumRead article →arXiv:2611.04553v1 Announce Type: new Abstract: We investigate the emission profiles of singly excited collective states and propose a matched-mode witnessing protocol in a mirror-terminated waveguide quantum electrodynamics system. The amplitudes and relative phases of the initial collective excitation are encoded in the temporal mode of the emitted single-photon wavepacket, providing a route to state verification…
arXiv QuantumRead article →arXiv:2611.04539v1 Announce Type: new Abstract: We prove the security of phase-encoded decoy-state BB84 quantum key distribution for a Mach-Zehnder receiver with imbalanced beam splitters and two threshold detectors that leak fine-grained information about the detection patterns.
arXiv QuantumRead article →arXiv:2611.04526v1 Announce Type: new Abstract: Quantum memory is a core enabling device for large-scale quantum networks, serving as the fundamental building block for quantum repeaters and transportable quantum memories. Among various physical platforms, rare-earth-ion-doped crystals stand out as one of the most promising solid-state candidates for long-lived photonic quantum memories, owing to their exceptionally…
arXiv QuantumRead article →arXiv:2611.04512v1 Announce Type: new Abstract: We consider a massive object, such as a neutral atom or an Unruh-DeWitt detector, moving at constant speed in a quantum field and investigate how motion affects the quantum coherence of its internal degrees of freedom, manifesting as quantum dispersion in the absence of a quantum field, and decoherence in its presence.
arXiv QuantumRead article →arXiv:2611.04496v1 Announce Type: new Abstract: Sample-based quantum diagonalization (SQD) accuracy remains limited for strongly correlated systems like iron-sulfur clusters. This accuracy heavily depends on the mean-field reference state, which determines the sampling ansatz and configuration-recovery target.
arXiv QuantumRead article →arXiv:2611.04442v1 Announce Type: new Abstract: We introduce the Pauli-Correlator Autoencoder (PCAE), a hybrid quantum--classical architecture for image reconstruction. PCAE splits an image into patches and compresses each patch as a matrix product state (MPS).
arXiv QuantumRead article →arXiv:2611.04432v1 Announce Type: new Abstract: Advances in free-electron quantum optics are establishing free electrons as a versatile quantum resource. Photon-induced near-field electron microscopy (PINEM) interactions and free drift provide elementary operations for shaping the longitudinal electron wavefunction, yet their full control capabilities remain unexplored.
arXiv QuantumRead article →arXiv:2611.04431v1 Announce Type: new Abstract: Quantum amplitude estimation can estimate expected discounted payoffs with quadratically fewer oracle calls than Monte Carlo, but each call requires coherent computation. We use language-model-assisted circuit design to reduce reversible payoff arithmetic for a three-asset worst-of autocallable and a target accrual redemption forward (TARF).
arXiv QuantumRead article →arXiv:2611.04381v1 Announce Type: new Abstract: Quantum circuit optimization is an indispensable component of the quantum software stack, used to reduce noise, maximize performance, alleviate costs of quantum error correction, or target specific hardware.
arXiv QuantumRead article →arXiv:2611.04363v1 Announce Type: new Abstract: We establish a conditional quantum Kac-Bernstein theorem for mixing of two independent, finite-mode bosonic inputs with quantum memories. We characterize exactly when the outputs are conditionally independent given both memories.
arXiv QuantumRead article →arXiv:2611.04306v1 Announce Type: new Abstract: How can noncommuting quantum observables retain the geometry of a classical phase space? Motivated by Mumford's question on approximately macroscopically unique (AMU) states and the work of Lin and Wang, we study synthetic spectra of position--momentum and angular-momentum systems. Under the hypotheses of their AMU theorems, nonempty synthetic spectra yield AMU states.
arXiv QuantumRead article →arXiv:2611.04290v1 Announce Type: new Abstract: We construct a universal quantum computational encoding via braiding in Links--Gould fusion spaces associated to $U_q^H(\mathfrak{sl}(2|1))$ where $q$ is on the unit circle and is not a root of unity.
arXiv QuantumRead article →arXiv:2611.04274v1 Announce Type: new Abstract: In this paper, we develop a semantic model for the parallel execution of quantum circuits, providing a formal foundation for studying shared-qubit concurrency in quantum computing. As in classical shared-memory concurrency, parallel quantum circuits may interfere with one another through operations on shared qubits.
arXiv QuantumRead article →arXiv:2611.04263v1 Announce Type: new Abstract: Building on our earlier results for closed quantum systems, we investigate the dynamical evolution of quantum fluctuations and their connections to Fisher information and the quantum operations describing open-system dynamics.
arXiv QuantumRead article →arXiv:2611.04198v1 Announce Type: new Abstract: We study deep variational circuits for a periodic Heisenberg chain under local gate depolarization, at depths where noiseless training is coherently exact. Full-width initializations reach low coherent error faster than circuits with confined transverse generators, but incur a larger noise shift and need an order of magnitude more updates for noisy convergence.
arXiv QuantumRead article →arXiv:2611.04129v1 Announce Type: new Abstract: Quantum identity authentication is an effective solution for establishing mutual trust between communicating parties in the post-quantum era. To address the risk of partial secret information leakage under special measurements, this paper designs a quantum identity authentication protocol based on perturbed probability amplitudes.
arXiv QuantumRead article →arXiv:2611.04128v1 Announce Type: new Abstract: Jointly supporting communication and distributed sensing over a shared, limited pool of entanglement resources is an attractive prospect for future quantum networks. We develop a network-level quantum integrated sensing and communication (Q-ISAC) framework in which a quantum base station dynamically allocates elementary Bell pairs between communication users and…
arXiv QuantumRead article →arXiv:2611.04105v1 Announce Type: new Abstract: We study single-query perfect anti-distinguishability/exclusion tasks of finite quantum channel ensembles, primarily using associated Choi operators and process POVMs. Weak perfect anti-distinguishability requires each measurement outcome to exclude an ensemble candidate with certainty, whereas the strong form additionally requires every candidate to have an exclusion…
arXiv QuantumRead article →arXiv:2611.04075v1 Announce Type: new Abstract: In Fault-Tolerant Quantum Computing (FTQC) using surface codes, reducing $T$-count is critical for efficient computation due to the high cost of $T$-state distillation. Probabilistic Quantum Circuit with Fallback (PQF) synthesis significantly lowers $T$-counts compared to standard protocols like Gridsynth, but introduces high circuit dynamism through extra gates…
arXiv QuantumRead article →arXiv:2611.04047v1 Announce Type: new Abstract: We consider a quantum integrated sensing and communication problem over an optical link in which a low-power transmitter simultaneously communicates with a receiver and identifies the range of a defect producing a backscattered signal.
arXiv QuantumRead article →arXiv:2611.04009v1 Announce Type: new Abstract: It was conjectured by Wehrl and proven by Lieb that the Shannon differential entropy of the Husimi function of a continuous-variable quantum state is lower bounded by the value it takes on coherent states. This corroborates the intuition, familiar from Heisenberg's uncertainty relations, that coherent states are minimal uncertainty states.
arXiv QuantumRead article →arXiv:2611.03987v1 Announce Type: new Abstract: Optimizing continuous-variable functions on qubit-based quantum hardware requires a finite representation of the search space and a solver-compatible representation of the objective function.
arXiv QuantumRead article →arXiv:2611.03984v1 Announce Type: new Abstract: Nitrogen-vacancy (NV) center spin ensembles are a promising platform for accurate vector magnetometry, as they offer measurements referenced to a spin Hamiltonian in an anisotropic crystal with native vector sensing capabilities.
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