Explore documented scientific discoveries, original research and new scientific developments. Search the library by topic, category or date.
The four volunteers who lived and worked in a simulated NASA Mars mission for more than a year will exit their habitat on Saturday, Oct. 31, after 378 days of isolation in a facility at the agency’s Johnson Space Center in Houston. Health and performance data collected from the simulation can help NASA develop methods […]
NASARead article →When Rice University student Malvika Bhardwaj asked her mentor Daniel Cohen, a Guidance, Navigation & Control (GN&C) engineer at NASA’s Johnson Space Center, whether he had time to keep teaching interns with his busy workload, he answered, “You decide what’s important.” In honor of National Mentoring Day on Oct. 27, Bhardwaj reflects on how Cohen’s […]
NASARead article →arXiv:2610.34249v1 Announce Type: new Abstract: We show that a vibration shared by two emitter subensembles can jointly establish multiphoton resonance and constructive interference among the virtual exchange pathways responsible for coherent conversion.
arXiv QuantumRead article →arXiv:2610.34176v1 Announce Type: new Abstract: We investigate the signatures of phase-space noncommutativity in an anisotropic oscillator and propose an optomechanical protocol to experimentally characterize it through Stokes-like measurements of an optical field.
arXiv QuantumRead article →arXiv:2610.34143v1 Announce Type: new Abstract: Practical fault-tolerant quantum computation requires a large number of physical qubits, posing a major challenge for scaling up individual quantum processors. Distributed architectures offer a promising solution by interconnecting multiple processors through quantum networks.
arXiv QuantumRead article →arXiv:2610.34079v1 Announce Type: new Abstract: We give a direct analytic proof that every total Boolean function computable exactly with at most two quantum queries depends on at most six input variables. This bound is sharp. A previous derivation relied on a numerical classification of Boolean functions on at most four variables; to the best of our knowledge, ours is the first unconditional proof.
arXiv QuantumRead article →arXiv:2610.34055v1 Announce Type: new Abstract: Quantum machine learning uses quantum states and dynamics to represent and process data. In quantum reservoir computing, the physical system is typically fixed and a classical readout is trained.
arXiv QuantumRead article →arXiv:2610.34003v1 Announce Type: new Abstract: Quantum processing units (QPUs) require frequent benchmarking to track hardware drift, yet standard protocols such as randomized benchmarking are resource-intensive and compete with application workloads for scarce QPU time.
arXiv QuantumRead article →arXiv:2610.33893v1 Announce Type: new Abstract: Quantum Fisher information (QFI) determines the ultimate precision of a quantum sensor after optimization over all allowed measurements, but it does not quantify how difficult the optimal readout is to implement.
arXiv QuantumRead article →arXiv:2610.33848v1 Announce Type: new Abstract: In a recent work we introduced a finite scalar-qubit-scalar spectral triple whose Connes distance reproduces the Bloch-ball trace metric up to a factor $2/\Lambda$, where $\Lambda^2=\mu_L^2+\mu_R^2$ for isotropic link strengths $\mu_L,\mu_R$ appearing in the proposed Dirac operator.
arXiv QuantumRead article →arXiv:2610.33834v1 Announce Type: new Abstract: Compiling classically optimized matrix product states (MPSs) into quantum circuits is a promising route to initial-state preparation for strongly correlated molecules, but the accuracy, gate cost, and classical scalability of existing MPS compilation methods have not been systematically assessed.
arXiv QuantumRead article →arXiv:2610.33800v1 Announce Type: new Abstract: Simulation of molecular vibrations is emerging as a promising application of quantum computing in quantum chemistry. In this work, we develop new strategies for block-encoding the second-quantized $n$-mode representation of the vibrational Hamiltonian, whose algebraic structure closely parallels that of the second-quantized electronic Hamiltonian.
arXiv QuantumRead article →arXiv:2610.33773v1 Announce Type: new Abstract: The Summers-Werner theorem shows that the vacuum of a relativistic quantum field theory violates the Bell-CHSH inequality maximally on complementary wedges, but it is an existence statement: it exhibits neither the observables nor an apparatus that measures them.
arXiv QuantumRead article →arXiv:2610.33723v1 Announce Type: new Abstract: Many tomography tasks require only a low-dimensional function of the state. We study local pure-state tomography under projective-fidelity access when a parametric model, a credible center, and a differentiable downstream task are known before acquisition.
arXiv QuantumRead article →arXiv:2610.33632v1 Announce Type: new Abstract: The wave--particle duality relation bounds visibility and path distinguishability but does not determine their attainable values in a fixed noisy interferometer. We characterize the complete attainable region for a two-path interferometer with a qubit marker, varying the marker input while fixing the source, preparation channel, path-dependent interaction, and…
arXiv QuantumRead article →arXiv:2610.33613v1 Announce Type: new Abstract: Recent papers have developed a cyclic symmetry projected extension for coherent state representations of bosonic Hilbert space. This extension can greatly reduce sampling errors in phase-space simulations of bosonic quantum systems that have symmetries. Here we prove an eigenvalue theorem for the continuum limit of the projected coherent states.
arXiv QuantumRead article →arXiv:2610.33607v1 Announce Type: new Abstract: Recovery from a coherent rotation with an unobserved angle depends on both the encoding and what calibration reveals about the noise. We determine their combined limit for a known finite-dimensional generator and one final recovery. Two polynomial projections organize the answer.
arXiv QuantumRead article →arXiv:2610.33591v1 Announce Type: new Abstract: Different physical faults can produce the same detector record while carrying opposite logical labels. We investigate the consequence of this ambiguity for a lattice surgery parity measurement. In a distance-three merge--split circuit, single-gate faults compete with reset/readout pairs on three complete syndromes.
arXiv QuantumRead article →arXiv:2610.33545v1 Announce Type: new Abstract: Hermitian polynomials in the quadrature operators $x$ and $p$ are the basic ingredients of continuous-variable quantum information, and increasingly exotic ones are now routinely engineered in superconducting circuits and trapped ions.
arXiv QuantumRead article →arXiv:2610.33532v1 Announce Type: new Abstract: Quantum computing offers promising approaches to combinatorial optimization problems whose search spaces grow exponentially with problem size. The Closest String problem belongs to this category, which seeks a string that minimizes the maximum Hamming distance to any string in a given collection of reference strings.
arXiv QuantumRead article →arXiv:2610.33429v1 Announce Type: new Abstract: Leggett-Garg (LG) inequalities test whether correlations measured at different times admit a positive joint probability distribution over histories. A violation requires negative values in any joint quasiprobability distribution reproducing those correlations, but such distributions can have negative values even without a violation.
arXiv QuantumRead article →arXiv:2610.33386v1 Announce Type: new Abstract: Zero-noise extrapolation (ZNE) is usually validated by the accuracy of mitigated observables, yet variational quantum optimization uses those observables to select parameters. We ask whether, and by how much, an accuracy gain from ZNE coincides with a worse decision.
arXiv QuantumRead article →arXiv:2610.33378v1 Announce Type: new Abstract: Higher-order squeezing Hamiltonians have several self-adjoint realizations, while their classical trajectories reach infinity in finite time. We relate these extension problems through boundary amplitudes and the semiclassical propagation of coherent states. A discrete Fourier transformation gives the sink-to-source ray matrix of each quantum realization.
arXiv QuantumRead article →arXiv:2610.33347v1 Announce Type: new Abstract: Color-dependent syndrome extraction schedules have been proposed to mitigate hook errors in the triangular color code. Recent work by Kishony and Fowler (arXiv:2603.28852) identifies distance-reducing hook errors by the type of anyon for which they provide a shortcut and chooses the CNOT ordering for stabilizers of each color to avoid these errors.
arXiv QuantumRead article →