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arXiv:2603.20792v1 Announce Type: new Abstract: Characterizing quantum magic -- the resource enabling computational advantage beyond stabilizer circuits -- is subtle in qubit systems because establish…
arXiv:2603.20786v1 Announce Type: new Abstract: In the presence of a globally conserved charge $N$, a natural question is whether a given separable state can be separated into charge-conserving compon…
arXiv:2603.20772v1 Announce Type: new Abstract: The state overlap, quantified via $\tr[\rho \sigma]$, is a metric widely used to assess the closeness between two quantum states $\rho$ and $\sigma$. Al…
arXiv:2603.20748v1 Announce Type: new Abstract: We demonstrate that the largest gap between the entangled value and the classical value for a one-round two-player nonlocal game with a perfect entangle…
arXiv:2603.20718v1 Announce Type: new Abstract: We propose a frequency-division multiplexed (FDM) continuous-variable quantum key distribution (CV-QKD) system with enhanced spectral efficiency through…
arXiv:2603.20717v1 Announce Type: new Abstract: Whether the sets of absolutely separable (AS) and absolutely two-qutrit positive-partial-transpose (AP) states are the same has been an open problem in …
arXiv:2603.20703v1 Announce Type: new Abstract: The quantum corrections to the behavior of a semi-classical gas can be expressed as a power series of the ratio $eta$ between the cube of De Broglie's t…
arXiv:2603.20694v1 Announce Type: new Abstract: Finding the minimum spanning tree (MST) of a graph is an important task in computer vision, as it enables a sparse and low-cost representation of connec…
arXiv:2603.20646v1 Announce Type: new Abstract: The scalability of quantum computing in supporting sophisticated algorithms critically depends not only on qubit quality and error handling, but also on…
arXiv:2603.20612v1 Announce Type: new Abstract: Non-Hermitian systems have emerged as a powerful paradigm for ultrasensitive sensing, leveraging unique spectral and dynamical properties that find no c…
arXiv:2603.20568v1 Announce Type: new Abstract: The development of many scalable quantum technologies requires single-photon nonlinearity, such as single-photon blockade, in solid-state systems. Recen…
arXiv:2603.20567v1 Announce Type: new Abstract: We point out that, when an optimization problem has more than one solution, the quantum adiabatic algorithms (QAA) encounter topological obstructions le…
arXiv:2603.20542v1 Announce Type: new Abstract: Scalable quantum characterization and error-mitigation workflows often rely on the assumption that relevant device noise and readout contamination can b…
arXiv:2603.20539v1 Announce Type: new Abstract: The main purpose of thispaper is to show that composite quantum-like (QL) systems can closely mimic the separable states of quantum systems, and that su…
arXiv:2603.20463v1 Announce Type: new Abstract: Quantum nonlinearity is an essential ingredient for many quantum technologies, but often the nonlinearity is too weak to be exploited at the few-photon …
arXiv:2603.20416v1 Announce Type: new Abstract: For classical point-to-point channels, it has been shown by Bennett et al. that quantum entanglement assistance cannot improve their capacity, and by Cu…
arXiv:2603.20401v1 Announce Type: new Abstract: We analyze the impact of photon loss on the photon-number statistics of Gaussian states. Specifically, we propose and carefully evaluate several methods…
arXiv:2603.20400v1 Announce Type: new Abstract: We study how matrix-product-operator (MPO) truncation errors evolve when simulating two setups: (1) 1D Haar-random circuits under either depolarizing no…
arXiv:2603.20399v1 Announce Type: new Abstract: We explore whether quantum field theory can be understood as the statistical mechanics of a time-reversal-invariant stochastic generalization of Hamilto…
arXiv:2603.20395v1 Announce Type: new Abstract: Optical key distribution (OKD) protects the physical layer of communication links by taking advantage of the inherent noise present in the photodetectio…
arXiv:2603.20376v1 Announce Type: new Abstract: We introduce the flag decomposition as a central tool for unitary synthesis. It lets us carve out a diagonal unitary with $2^n$ degrees of freedom in su…
arXiv:2603.20372v1 Announce Type: new Abstract: Low-dimensional materials exhibit exotic properties due to enhanced quantum fluctuations, making the understanding of their microscopic origin central i…
arXiv:2603.20369v1 Announce Type: new Abstract: We study error correction type protocols in which a quantum channel encodes logical information into an enlarged Hilbert space. Specifically, we conside…
arXiv:2603.20294v1 Announce Type: new Abstract: We construct a three-dimensional Calderbank-Shor-Steane (CSS) stabilizer code on the Face-Centered Cubic (FCC) lattice. Physical qubits reside on the ed…