122 citations · 359 across the 26 of their papers we have counts for
28 papers
Reduced density matrix approach to one-dimensional ultracold bosonic systems
Mitchell J. Knight, Harry M. Quiney, Andy M. Martin
The variational determination of the two-boson reduced density matrix is described for a one-dimensional system of (where ranges from to ) harmonically trapped bo…
Full Band Structure Calculation of Semiconducting Materials on a Noisy Quantum Processor
Shaobo Zhang, Akib Karim, Harry M. Quiney +1
Quantum chemistry is a promising application in the era of quantum computing since the unique effects of quantum mechanics that take exponential growing resources to simulate class…
Vacuum polarization in molecules I: Uehling interaction
D. J. Flynn, I. P. Grant, H. M. Quiney
Radiative corrections to electronic structure are characterized by perturbative expansions in and , where is the fine-structure constant and is the nuclear charge.…
Vacuum polarization in molecules II: higher order corrections
D. J. Flynn, I. P. Grant, H. M. Quiney
We outline a general formalism for treating vacuum polarization phenomena within an effective field expansion. The coupling between source charges and virtual fields is examined fr…
Heavy-element damage seeding in proteins under XFEL illumination
Spencer K. Passmore, Alaric L. Sanders, Andrew V. Martin +1
Serial femtosecond X-ray crystallography (SFX) captures the structure and dynamics of biological macromolecules at high spatial and temporal resolutions. The ultrashort pulse produ…
Precise predictions and new insights for atomic ionisation from the Migdal effect
Peter Cox, Matthew J. Dolan, Christopher McCabe +1
The scattering of neutral particles by an atomic nucleus can lead to electronic ionisation and excitation through a process known as the Migdal effect. We revisit and improve upon…
Fast unified reconstruction algorithm for conventional, phase-contrast and diffraction tomography
Timur E. Gureyev, Hamish G. Brown, Harry M. Quiney +1
A unified method for three-dimensional reconstruction of objects from transmission images collected at multiple illumination directions is described. The method may be applicable t…
Reduced density matrix approach to ultracold few-fermion systems in one dimension
Mitchell J. Knight, Harry M. Quiney, Andy M. Martin
The variational determination of the two-fermion reduced density matrix is described for harmonically trapped, ultracold few-fermion systems in one dimension with equal spin popula…
Relative roles of multiple scattering and Fresnel diffraction in the imaging of small molecules using electrons, Part II: Differential Holographic Tomography
T. E. Gureyev, H. M. Quiney, A. Kozlov +3
It has been argued that in atomic-resolution transmission electron microscopy (TEM) of sparse weakly scattering structures, such as small biological molecules, multiple electron sc…
speckle-tracking: a Software Suite for Ptychographic X-ray Speckle Tracking
Andrew J. Morgan, Kevin T. Murray, Harry M. Quiney +2
In recent years, x-ray speckle tracking techniques have emerged as viable tools for wavefront metrology and sample imaging applications. These methods are based on the measurement…
Ptychographic X-ray Speckle Tracking
Andrew J. Morgan, Harry M. Quiney, Saša Bajt +1
We present a method for the measurement of the phase gradient of a wavefront by tracking the relative motion of speckles in projection holograms as a sample is scanned across the w…
Noise-resolution uncertainty principle in classical and quantum systems
Timur E. Gureyev, Alexander Kozlov, Yakov I. Nesterets +2
It is proved that the width of a function and the width of the distribution of its values cannot be made arbitrarily small simultaneously. In the case of ergodic stochastic process…
Comparison of Hartree-Fock and Hartree-Fock-Slater approximations for calculation of radiation damage dynamics of light and heavy atoms in the field of x-ray free electron laser
Alexander Kozlov, Harry M. Quiney
Simulations of radiation damage in single molecule imaging using a X-ray free electron laser use atomic rates calculated in the lowest order. We investigate the difference in ion y…
On the "unreasonable" effectiveness of Transport of Intensity imaging and optical deconvolution
T. E. Gureyev, Ya. I. Nesterets, A. Kozlov +2
The effectiveness of reconstructive imaging using the Homogeneous Transport of Intensity equation may be regarded as "unreasonable", because it has been shown to significantly incr…
On the van Cittert - Zernike theorem for intensity correlations and its applications
Timur E. Gureyev, Alexander Kozlov, David M. Paganin +3
A reciprocal relationship between the autocovariance of the light intensity in the source plane and in the far-field detector plane is presented in a form analogous to the classica…
Label-free three-dimensional (3D) structural imaging in live cells using intrinsic optical refractive index
Chen Liu, Michael Malek, Ivan K. H. Poon +10
Here we report a method for visualization of volumetric structural information of live biological samples with no exogenous contrast agents. The process is made possible through a…
On noise-resolution uncertainty in quantum field theory
Timur E. Gureyev, Alexander Kozlov, Yakov I. Nesterets +2
An uncertainty inequality is presented that establishes a lower limit for the product of the variance of the time-averaged intensity of a mode of a quantized electromagnetic field…
Application of sampling theory in modeling of continuum processes: photoionization cross-sections of atoms
Alex Kozlov, Saumitra Saha, Harry Quiney
We describe a method for the calculation of photoionization cross-sections using square-integrable amplitudes obtained from the diagonalization of finite-basis set representations…
Precise and accurate measurements of strong-field photoionisation and a transferrable laser intensity calibration standard
W. C. Wallace, O. Ghafur, C. Khurmi +12
Ionization of atoms and molecules in strong laser fields is a fundamental process in many fields of research, especially in the emerging field of attosecond science. So far, demons…
Analysis of two and three dipolar bosons in a spherical harmonic trap
C. J. Bradly, H. M. Quiney, A. M. Martin
As dipolar gases become more readily accessible in experiment there is a need to develop a comprehensive theoretical framework of the few-body physics of these systems. Here, we ex…
Single molecule imaging with longer x-ray laser pulses
Andrew V. Martin, Justine K. Corso, Carl Caleman +2
During the last five years, serial femtosecond crystallography using x-ray laser pulses has developed into a powerful technique for determining the atomic structures of protein mol…
Coupled pair approach for strongly-interacting trapped fermionic atoms
C. J. Bradly, B. C. Mulkerin, A. M. Martin +1
We present a coupled pair approach for studying few-body physics in harmonically trapped ultracold gases. The method is applied to a two-component Fermi system of particles. A…
Femtosecond X-ray Laser induced transient electronic phase change observed in fullerene C60
Brian Abbey, Ruben A. Dilanian, Connie Darmanin +17
X-ray Free-Electron Lasers (XFELs) deliver X-ray pulses with a coherent flux that is approximately eight orders of magnitude greater than that available from a modern third generat…
Universality and itinerant ferromagnetism in rotating strongly interacting Fermi gases
B. C. Mulkerin, C. J. Bradly, H. M. Quiney +1
We analytically determine the properties of three interacting fermions in a harmonic trap subject to an external rotation. Thermodynamic quantities such as the entropy and energy a…