A bithermal Marcus formalism for molecule-metal electron transfer predicts that interfacial heat conduction has an electronic component that survives at zero net electronic current.
Benchmarking Error Mitigation: Artefactual Improvements in Zero-Noise Extrapolation
8 Pith papers cite this work. Polarity classification is still indexing.
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abstract
Reliable benchmarking of Quantum Error Mitigation (QEM) requires distinguishing genuine improvements from artefacts of the post-processing arithmetic. In this paper, we expose a failure mode in Richardson Zero-Noise Extrapolation (ZNE), a widely used technique routinely (and often implicitly) relied upon in benchmarks and experiments. When noise amplification operates beyond usable signals - a regime that is quickly reached on current hardware for non-trivial circuits - we show that the extrapolation no longer reflects the underlying physics, but collapses into a fixed rescaling of a single noisy measurement, producing a bogus apparent improvement that is independent of noise amplification. This poses a rarely considered threat to the validity of many empirical evaluations in quantum computing. Measurements on real hardware (IQM Euro-Q-Exa) confirm this collapse with ordinary folding alone: as circuit depth erodes the signal, the reported estimate decouples from the truth and overshoots the ideal by up to 21%. We further introduce a matched-cost "garbage-folding" negative control that carries no usable signal yet reports a larger apparent improvement than genuine folding - showing that the magnitude of an improvement is not evidence of its correctness - alongside a zero-cost check flagging the artefact from data a benchmark already holds. We distil both into a short reporting checklist for ZNE benchmarks.
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The paper implements relativistic two-component DIP-EOMCCSD/SDT with the Dirac-Coulomb-Breit Hamiltonian and shows that a composite scheme reproduces noble-gas double ionization potentials to better than 0.03 eV.
A coupled cluster framework for interacting electrons and phonons is presented, benchmarked on the Hubbard-Holstein model, and applied to preliminary diamond band-gap renormalization calculations.
Coupled-cluster simulations of laser-driven electrons can be decomposed into populations of field-free energy levels using equation-of-motion and linear-response projectors, matching exact full configuration interaction when the participating states are well approximated.
A depth-one QAOA cost layer on a five-qubit superconducting component is certified by tomography to prepare an entangled state (negativity 0.077, 95% CI [0.065, 0.091] over six calibrations), and a Bell-state manipulation shows the CZ drive amplitude causally controls the certified negativity.
A relativistic EOM-CCSD method using ADC(2)-derived state-specific frozen natural spinors with X2CAMF and Cholesky decomposition gives excitation energies close to the canonical method at reduced cost.
Periodically switching the oscillation frequency of one thermal bath in a Langevin model is shown analytically and by simulation to reshape heat transport hysteresis, producing pinched and multi-loop curves.
citing papers explorer
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Electron transfer at thermally heterogeneous molecule-metal interfaces
A bithermal Marcus formalism for molecule-metal electron transfer predicts that interfacial heat conduction has an electronic component that survives at zero net electronic current.
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Relativistic Two-component Double Ionization Potential Equation-of-Motion Coupled Cluster with the Dirac--Coulomb--Breit Hamiltonian
The paper implements relativistic two-component DIP-EOMCCSD/SDT with the Dirac-Coulomb-Breit Hamiltonian and shows that a composite scheme reproduces noble-gas double ionization potentials to better than 0.03 eV.
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A coupled cluster framework for electrons and phonons
A coupled cluster framework for interacting electrons and phonons is presented, benchmarked on the Hubbard-Holstein model, and applied to preliminary diamond band-gap renormalization calculations.
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Interpretation of Coupled-Cluster Many-Electron Dynamics in Terms of Stationary States
Coupled-cluster simulations of laser-driven electrons can be decomposed into populations of field-free energy levels using equation-of-motion and linear-response projectors, matching exact full configuration interaction when the participating states are well approximated.
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Certifying bipartite entanglement on a superconducting processor from a corrected QAOA cost layer
A depth-one QAOA cost layer on a five-qubit superconducting component is certified by tomography to prepare an entangled state (negativity 0.077, 95% CI [0.065, 0.091] over six calibrations), and a Bell-state manipulation shows the CZ drive amplitude causally controls the certified negativity.
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Reduced-cost Relativistic Equation-of-Motion Coupled Cluster Method based on Frozen Natural Spinors: A State-Specific Approach
A relativistic EOM-CCSD method using ADC(2)-derived state-specific frozen natural spinors with X2CAMF and Cholesky decomposition gives excitation energies close to the canonical method at reduced cost.
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Heat Transport Hysteresis Generated through Frequency Switching of a Time-Dependent Temperature Gradient
Periodically switching the oscillation frequency of one thermal bath in a Langevin model is shown analytically and by simulation to reshape heat transport hysteresis, producing pinched and multi-loop curves.
- Classically Augmented Zero-Noise Extrapolation