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Australia has designated a seabed storage site near its northern coast where a Japanese company plans to store massive amounts of carbon pollution using a technology that has divided climate scientists.
Phys.org ResearchRead article →Google has said it will switch off its AI tools for schoolchildren by default, after drawing criticism for pushing artificial intelligence features to students while schools are still debating how the technology should be used in classrooms.
Phys.org ResearchRead article →A giant rodent weighing around 30 kilograms (66 pounds) roamed what is now southern Thailand 33 to 35 million years ago, scientists said, after identifying a previously unknown species from two fossilized teeth.
Phys.org ResearchRead article →The third-largest island in the Mediterranean Sea exposes an ancient piece of the ocean floor and hosts a clowder of cats.
NASARead article →APOD Science APOD APOD: 2026 November 5 –… Today’s APOD Archive Submissions Index Search Calendar RSS Education About Discuss APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Enceladus in Silhouette […]
NASARead article →arXiv:2611.05976v1 Announce Type: new Abstract: For more than half a century, the standard quantum limit (SQL) was thought to limit the laser coherence $\mathfrak{C}$ -- the number of photons emitted from the laser into the beam in one coherence time -- to a scaling $\Theta(\mu^2)$, where $\mu$ is the mean number of optical-frequency excitations stored inside the laser.
arXiv QuantumRead article →arXiv:2611.05975v1 Announce Type: new Abstract: We introduce SqDMRG, which combines sample-based quantum diagonalization (SQD) with the density matrix renormalization group (DMRG). SqDMRG expands the sampled determinant space into a product of fragment spaces constructed from the samples, and solves the Hamiltonian in this product space using DMRG.
arXiv QuantumRead article →arXiv:2611.05955v1 Announce Type: new Abstract: Perfectly matching local outcomes need not constitute a nondisturbing shared classical record. For finite-dimensional multipartite states, we prove that nontrivial exact records are equivalent to a spectrum sharing structure with a unique finest decomposition into locally distinguishable sectors, where entanglement may persist.
arXiv QuantumRead article →arXiv:2611.05943v1 Announce Type: new Abstract: Bounding the acceptance probabilities of quantum measurements is a recurring task in quantum information theory. An acceptance probability averaged over a random measurement setting can be bounded uniformly over the input state by the operator norm of an average of positive semidefinite operators.
arXiv QuantumRead article →arXiv:2611.05941v1 Announce Type: new Abstract: Quantum Selected Configuration Interaction (QSCI) constructs a variational determinant space from measurements of a prepared electronic state, but finite-shot sampling can repeatedly observe high-probability determinants, limiting efficient discovery of configurations important for an accurate selected-CI description.
arXiv QuantumRead article →arXiv:2611.05912v1 Announce Type: new Abstract: In the welded trees problem, an algorithm navigates a randomly labeled graph formed from two binary trees joined at their leaves through a "weld" of connecting edges. A quantum walk can navigate from root to root exponentially faster than any classical algorithm.
arXiv QuantumRead article →arXiv:2611.05883v1 Announce Type: new Abstract: Neural-surrogated quantum-enhanced Markov chain Monte Carlo (QeMCMC) uses neural networks trained on samples from the quantum approximate optimization algorithm (QAOA) to accelerate Boltzmann sampling. A divide-and-conquer strategy extends this approach to larger systems, but independently optimizing QAOA parameters for each subproblem is costly.
arXiv QuantumRead article →arXiv:2611.05868v1 Announce Type: new Abstract: Many sensing and imaging problems must contend with unknown nuisance parameters such as aberrations, background fields, and drift, and the cost of removing these noise sources can dominate the sample budget. In contrast to classical receivers, a quantum receiver can processes samples jointly to directly access observables in which common nuisance is suppressed.
arXiv QuantumRead article →arXiv:2611.05867v1 Announce Type: new Abstract: We present a method for efficient simulation of error propagation and decoding in universal fault-tolerant quantum circuits under stochastic Pauli noise, requiring only that the circuit has a high fault distance and that all logical non-Clifford operations are implemented by physical T, CS and CCZ gates.
arXiv QuantumRead article →arXiv:2611.05865v1 Announce Type: new Abstract: Quantum numbers associated with symmetries classify quantum states and identify the sectors relevant to a given simulation. Generic hardware-efficient ansatzes do not necessarily preserve the quantum numbers and may therefore explore states outside the target sector.
arXiv QuantumRead article →arXiv:2611.05826v1 Announce Type: new Abstract: Competing quantum contacts can create a boundary that was absent from the specification of a subsystem. We construct approximately isolated bodies from bare field vacuum and zero-centred contact packets. A binding contribution with vanishing mean energy density nevertheless changes a bounded formation signal by order one at the same clock.
arXiv QuantumRead article →arXiv:2611.05792v1 Announce Type: new Abstract: In quantum property estimation, an experimenter estimates $\operatorname{Tr}(O\rho)$ for a family of observables from independent copies of an unknown state $\rho$ simultaneously to additive error $\epsilon$.
arXiv QuantumRead article →arXiv:2611.05757v1 Announce Type: new Abstract: Pure states of four and seven qubits cannot be maximally entangled across every balanced bipartition; we determine how entangled they can be on average. For four qubits we prove the conjecture of Higuchi and Sudbery: the mean von Neumann entropy of the three $2|2$ cuts is at most $1+\tfrac12\log_2 3$ bits, with equality exactly on the local-unitary orbits of their…
arXiv QuantumRead article →arXiv:2611.05722v1 Announce Type: new Abstract: Most quantum-computer security work targets physical-layer attacks on qubits, while two surfaces remain inadequately defended: the quantum-error-correction (QEC) syndrome-and-decoder pipeline, and the classical control and software stack that runs it.
arXiv QuantumRead article →arXiv:2611.05681v1 Announce Type: new Abstract: Integrated photonics provides a promising route towards the development of large-scale, stable and low-loss quantum hardware. Existing implementations of universal quantum photonic chips generally rely on architectures consisting of localised interactions between the modes that can be programmed with known algorithms to implement specific operations.
arXiv QuantumRead article →arXiv:2611.05627v1 Announce Type: new Abstract: Designing a superconducting quantum processor rests on predicting the low-lying spectrum of its coupled circuit. The Hilbert-space dimension of the circuit's lumped-element model grows exponentially with the number of circuit nodes. The usual methods split the circuit into subsystems, but that split is hard to choose when the elements are strongly coupled.
arXiv QuantumRead article →arXiv:2611.05604v1 Announce Type: new Abstract: The rate at which quantum fluctuations of observables can change provides a useful characterization of the dynamical behavior of quantum systems. For closed quantum systems undergoing unitary evolution, previous work has established a general upper bound on the growth rate of the uncertainty of an observable in terms of the standard deviation of its dynamical velocity.
arXiv QuantumRead article →arXiv:2611.05603v1 Announce Type: new Abstract: We study a mixed block encoding of quantum-chemistry Hamiltonians for quantum phase estimation (QPE) on fault-tolerant quantum computers. Following a Cholesky decomposition of the electron repulsion integral tensor, we assign each Cholesky tensor to either a double-factorization (DF) branch or a sparse-single-factorization (SPSF) branch.
arXiv QuantumRead article →arXiv:2611.05597v1 Announce Type: new Abstract: Establishing multipartite entanglement across lossy optical networks remains a central challenge for distributed quantum information processing. Here, we consider a non-Gaussian continuous-variable entanglement-swapping protocol combining a symmetric discrete Fourier transform (DFT) interferometer with photon-number-resolving detection.
arXiv QuantumRead article →