Photon Correlations Control Quantum Fisher Information in Coherent Multidimensional Spectroscopy
An arXiv manuscript examines how photon statistics from quantum sources set limits on extracting molecular parameters from nonlinear optical signals.
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Bounds on Attainable Rate Modulation in Fermi's Golden Rule
A paper deriving bounds on attainable modulation of transition rates via Fermi's golden rule appeared on arXiv.
The Lévy wave packet and fractional uncertainty relations
Researchers posted an arXiv preprint examining uncertainty principles via Levy wave packets in fractional quantum mechanics and suggesting a bound tied to the Levy index.
Convergence Analysis of the Quantum Blahut-Arimoto Algorithm and the Contraction Coefficient of Qubit Amplitude-Damping Channels
Researchers analyzed convergence of the quantum Blahut-Arimoto algorithm for coherent information of less noisy channels and derived the contraction coefficient for qubit amplitude-damping channels via Taylor expansion.
Quantum Simulation of Non-Markovian Open Quantum Systems via Low-Rank Kernel Compression and Coupling Dilution
An arXiv paper presents an error-controlled framework that simulates non-Markovian open quantum dynamics in Gaussian environments by compressing the bath correlation kernel.
Adapted Fröhlich-Pizzo Model for Horizon-Induced Decoherence
Researchers showed that a modified Fröhlich-Pizzo model using U(1) chiral current algebras reproduces key aspects of horizon-induced decoherence.
Spin - resolved momentum distributions and vortex evolution in multiphoton pair production within a modified two-level model
An arXiv paper studies spin-resolved momentum distributions and vortex evolution in multiphoton pair production via a modified two-level model retaining diagonal spinor terms.
Boundary exceptional point driven chiral switch of topological edge states
Low-field dephasing time of an optically polarized NV⁻ spin bath beyond the P1 limit in diamond: a cluster-correlation-expansion and exact spin-bath study
Cluster-correlation-expansion calculations show that converting P1 centers to NV- centers in diamond extends low-field spin-bath dephasing times under optical pumping to the ms=0 state.
DOE ARPA-E Launches $37 Million QC3 Program Across Ten Quantum Chemistry Performers
The Department of Energy's ARPA-E started a 37 million dollar QC3 program involving ten quantum chemistry performers including QuEra.
Quantum state smoothing for tracking optical quantum dynamics and recovering purity and squeezing
npj Quantum Information published a paper on smoothing quantum states to follow dynamics in optical systems.
Alice & Bob shares first results from France's PROQCIMA quantum programme
Alice & Bob released initial findings from the PROQCIMA quantum program supported by France.
Hybrid quantum repeater chains with atom-based quantum processing units and quantum memory multiplexers
Shin Sun and coauthors published an analysis of hybrid quantum repeater chains using atom-based processing units and multiplexed quantum memories in Physical Review A.
Eigenstate-thermalization-hypothesis-ansatz-motivated environmental-branch approach to open quantum systems
Wen-ge Wang published a method in Physical Review A for studying open quantum systems with a small central system coupled to an ETH-satisfying chaotic environment.
Complementarity in quantum and general information theories
Rolino, Perinotti and Tosini defined complementarity via value conflicts and established its match to observable incompatibility in quantum theory.
Enabling Deterministic Passive Quantum State Transfer with Giant Atoms
Researchers reported in PRX Quantum that tailored coupling of giant atoms to a waveguide enables deterministic state transfer above 99 percent fidelity without time-dependent control.
Quantinuum Closes In on One Million Error-Free Operations
Quantinuum reported demonstrations of quantum error correction codes and logical computations with declining error rates.
Faster qLDPC: Up to 74x Speedup for Logical Gates
IonQ researchers achieved up to 74 times faster Clifford gates and 5 times faster Toffoli gates with an improved qLDPC error-correction approach.
What It Means to Put a Quantum Roadmap to the Test
DARPA selected IonQ for the final phase of its QBI program and will test the company's quantum computers through 2029 under an agreement worth up to 300 million dollars.
Xanadu Secures Up to USD $10 Million in Additional DARPA Support to Accelerate Quantum R&D Roadmap
Xanadu announced it secured up to 10 million USD in additional funding from DARPA.
Multirobust Control Pulses Designed by Iterative Quantum Kolmogorov-Arnold-Moser Algorithm
M. Harutyunyan and S. Guérin published a multirobust quantum control strategy in Physical Review Letters that suppresses multilevel leakage in qubits while providing robustness to control inhomogeneities.
Deterministic quantum states storage via dynamical control of subradiant states
Dynamical evolution of quantum scattering in ${\mathrm{Li}}^{+}+{\mathrm{H}}^{−}$ mutual neutralization from the meV/u to the keV/u regime
Researchers used a quantum molecular-orbital close-coupling method with ab initio potentials to calculate reaction mechanisms in Li+ + H- mutual neutralization from meV/u to keV/u energies.
Robust quantum key distribution with imperfections in state preparation and characterization
Researchers published a paper in Physical Review A analyzing a quantum key distribution scheme that tolerates imperfections in state preparation and characterization.
Hybrid quantum-classical framework for Betti-number estimation with applications to topological data analysis
Noise-robustness for delegated quantum computation in the circuit model
Anne Broadbent and Joshua Nevin published a study on noise robustness for verifiable delegated quantum computation in the circuit model.
Continuous-time quantum control across an exponentially small bottleneck in a frustrated Ising ring model
Catalytic quantum thermodynamics beyond additivity and reduced-state monotones
Physicists Günhan, Pusuluk, Oikonomou and Bagci reported analysis of thermodynamic constraints in quantum catalysis in Physical Review A.
Fragile single-cone Dirac quantum walks in two dimensions
Beenakker, Sánchez Fernán and Tworzydło showed that two-dimensional single-cone Dirac quantum walks are unstable to perturbations.
High-Dimensional Quantum Key Distribution via Full Core-Mode Encoding over Deployed Multicore Fibers
G. H. dos Santos and coauthors reported experimental results for four-dimensional quantum key distribution with complete core-mode encoding on installed multicore fibers in PRX Quantum.
Infleqtion Convenes Business Leaders in London to Chart Quantum Commercial Value
Infleqtion convened business leaders in London to discuss quantum commercial value.
Kipu Quantum Demonstrates Neutral-Atom Quantum Feature Extraction for Molecular Toxicity Classification on QuEra Hardware
Kipu Quantum tested neutral-atom quantum methods to extract features for classifying molecular toxicity, using QuEra hardware.
Xanadu files 6-K
Xanadu submitted a Form 6-K to the U.S. Securities and Exchange Commission.
Scalability bottlenecks in entanglement-based satellite quantum key distribution: downlink asymmetry, orbit dependence and finite-key effects
A paper analyzing limitations in satellite quantum key distribution with entangled photons was published in npj Quantum Information.
Programmable high-dimensional state synthesis through a 20-m multimode fiber via long-coherence atomic photons
A paper in npj Quantum Information reports generating programmable high-dimensional quantum states sent by coherent atomic photons across a 20 m multimode fiber.
QuEra Helps Aim For A 100x Leap In Quantum Chemistry Models
QuEra contributed to targets for a 100-fold expansion in quantum chemistry model scale.
Thermodynamic Uncertainty Relation with Quantum Feedback
Quantum-corrected Floquet dynamics: Bridging fully quantum and semiclassical regimes
Heisenberg scaling in optical magnetometry with measurement-induced correlations as a quantum resource
Engelhardt and coauthors showed that continuous collective measurements alone can generate many-body correlations for Heisenberg-limited precision in optical magnetometry.
Probability distribution analysis of the cascaded variational quantum eigensolver
Researchers analyzed probability distributions for the cascaded variational quantum eigensolver that removes iterative quantum-classical communication in standard VQE.