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Smeared Coulomb potential orbitals for the electron-nucleus mean field configuration interaction method. (arXiv:1706.04481v2 [physics.chem-ph] UPDATED)

We propose to use the eigenfunctions of a one-electron model Hamiltonian to
perform electron-nucleus mean field configuration interaction (EN-MFCI)
calculations. The potential energy of our model Hamiltonian corresponds to the
Coulomb potential of an infinite wire with charge $Z$ distributed according to
a Gaussian function. The time independent \sch equation for this Hamiltonian is
solved perturbationally in the limit of small amplitude vibration (Gaussian
function width close to zero).

High-resolution spectroscopy of single nuclear spins via sequential weak measurements. (arXiv:1806.02181v2 [quant-ph] UPDATED)

Quantum sensors have recently achieved to detect the magnetic moment of few
or single nuclear spins and measure their magnetic resonance (NMR) signal.
However, the spectral resolution, a key feature of NMR, has been limited by
relaxation of the sensor to a few kHz at room temperature. The spectral
resolution of NMR signals from single nuclear spins can be improved by, e.g.,
using quantum memories, however at the expense of sensitivity. Classical
signals on the other hand can be measured with exceptional spectral resolution

Noncommutative Lp-Spaces and Perturbations of KMS States. (arXiv:1806.03488v3 [math-ph] UPDATED)

We extend the theory of perturbations of KMS states to some class of
unbounded perturbations using noncommutative Lp-spaces. We also prove certain
stability of the domain of the Modular Operator associated to a
||.||p-continuous state. This allows us to define an analytic multiple-time KMS
condition and to obtain its analyticity together with some bounds to its norm.

Analytical solution of the Klein Gordon equation with a Multi-parameter q-Deformed Woods-Saxon Type Potential. (arXiv:1808.03448v1 [quant-ph])

In this manuscript, we present analytical solution of the Klein-Gordon
equation with the multi-parameter q-deformed Woods-Saxon type potential energy
under the spin symmetric limit in $(1+1)$ dimension. In the scattering case, we
obtain the reflection and transmission probabilities and prove the conservation
of the total probability. Moreover, we analyze the correlation between the
potential parameters with the reflection and transmission probabilities. In the

Wave Particle Duality in Asymmetric Beam Interference. (arXiv:1711.10219v2 [quant-ph] UPDATED)

It is well known that in a two-slit interference experiment, acquiring
interference. It is argued that path-information has a meaning only when one
can umabiguously tell which slit the particle went through. Using this idea,
two duality relations are derived for the general case where the two paths may
not be equally probable, and the two slits may be of unequal widths. These
duality relations, which are inequalities in general, saturate for all pure

Fast universal logical gates on topologically encoded qubits at arbitrarily large code distances. (arXiv:1806.02358v2 [quant-ph] UPDATED)

A fundamental question in the theory of quantum computation is to understand
the ultimate space-time resource costs for performing a universal set of
logical quantum gates to arbitrary precision. To date, all proposed schemes for
implementing a universal logical gate set, such as magic state distillation or
code switching, require a substantial space-time overhead, including a time
overhead that necessarily diverges in the limit of vanishing logical error

Fast three-qubit Toffoli quantum gate based on the three-body F\"{o}rster resonances in Rydberg atoms. (arXiv:1808.03473v1 [quant-ph])

We propose a scheme of fast three-qubit Toffoli quantum gate for ultracold
neutral-atom qubits. The scheme is based on the Stark-tuned three-body
F\"{o}rster resonances, which we have observed in our recent experiment
[D.B.Tretyakov et al., Phys.Rev.Lett. 119, 173402 (2017)]. The three-body
resonance corresponds to a transition when the three interacting atoms change
their states simultaneously, and it occurs at a different dc electric field
with respect to the two-body F\"{o}rster resonance. A combined effect of

Active engineering of four-wave mixing spectral entanglement in hollow-core fibers. (arXiv:1807.11402v2 [quant-ph] UPDATED)

We demonstrate theoretically and experimentally a high level of control of
the four-wave mixing process in an inert gas filled inhibited-coupling guiding
hollow-core photonic crystal fiber in order to generate photon pairs. The
specific multiple-branch dispersion profile in such fibers allows both
entangled and separable bi-photon states to be produced. By controlling the
choice of gas, its pressure and the fiber length, we experimentally generate
various joint spectral intensity profiles in a stimulated regime that is

On the Complexity of Solving Subtraction Games. (arXiv:1808.03494v1 [quant-ph])

We study algorithms for solving Subtraction games, which sometimes are
referred to as one-heap Nim games. We describe a quantum algorithm which is
applicable to any game on DAG, and show that its query compexity for solving an
arbitrary Subtraction game of $n$ stones is $O(n^{3/2}\log n)$. The best known
deterministic algorithms for solving such games are based on the dynamic
programming approach. We show that this approach is asymptotically optimal and
that classical query complexity for solving a Subtraction game is generally

Enhanced entanglement criterion via symmetric informationally complete measurements. (arXiv:1805.03955v3 [quant-ph] UPDATED)

We show that a special type of measurements, called symmetric informationally
complete positive operator-valued measures (SIC POVMs), provide a stronger
entanglement detection criterion than the computable cross-norm or realignment
criterion based on local orthogonal observables. As an illustration, we
demonstrate the enhanced entanglement detection power in simple systems of
qubit and qutrit pairs. This observation highlights the significance of SIC
POVMs for entanglement detection.