Quantum Science

... and Monika Schleier-Smith (STS 2001), Associate Professor of Physics at ... interest in the field first piqued after learning about quantum mechanics.... Read more
Published on: 2020-05-29
Anna Hargreaves, Assistant Professor in the Department of Biology, is a ... “This, however, now opens the possibility in quantum mechanics that ...... Read more
Published on: 2020-05-29
... atheist while a graduate student in quantum mechanics at Yale University. ... to try and explore the more human side of science which was biology.... Read more
Published on: 2020-05-29
... an applied sciences company based on a patented quantum biology platform that significantly boosts the potency and efficiency of any plant-based ...... Read more
Published on: 2020-05-29
... University of Surrey: “As a 'renowned world expert' on quantum biology, quantum entanglement and relativistic time dilation, I can say, categorically, ...... Read more
Published on: 2020-05-29
General relativity as a classical field theory does not predict gravitationally induced entanglement, as such, recent proposals seek an empirical demonstration of this feature which would represent a significant milestone for physics. We introduce improvements to a spin witness protocol that reduce the highly challenging experimental requirements. After rigorously assessing... Read more
Published on: 2020-05-29
We analyze the structure of the space of temporal correlations generated by quantum systems. We show that the temporal correlation space under dimension constraints can be nonconvex, and derive nonlinear inequalities to witness the nonconvexity for qubits and qutrits in the simplest scenario. For the general case, we provide the... Read more
Published on: 2020-05-29
Assuming that the degrees of freedom of a black hole are finite in number and of fermionic nature, we naturally obtain, within a second-quantized toy model of the evaporation, that the Bekenstein bound is a consequence of the Pauli exclusion principle for these fundamental degrees of freedom. We show that... Read more
Published on: 2020-05-29
Preparing and observing quantum states of nanoscale particles is a challenging task with great relevance for quantum technologies and tests of fundamental physics. In contrast to atomic systems with discrete transitions, nanoparticles exhibit a practically continuous absorption spectrum and thus their quantum dynamics cannot be easily manipulated. Here, we demonstrate... Read more
Published on: 2020-05-29
Coupling with an external environment inevitably affects the dynamics of a quantum system. Here, we consider how charging performances of a quantum battery, modelled as a two level system, are influenced by the presence of an Ohmic thermal reservoir. The latter is coupled to both longitudinal and transverse spin components... Read more
Published on: 2020-05-29
We introduce a quantity, called pseudo entropy, as a generalization of entanglement entropy via post-selection. In the AdS/CFT correspondence, this quantity is dual to areas of minimal area surfaces in time-dependent Euclidean spaces which are asymptotically AdS. We study its basic properties and classifications in qubit systems. In specific examples,... Read more
Published on: 2020-05-29
A two-dimensional array of Kerr-nonlinear parametric oscillators (KPOs) with local four-body interactions is a promising candidate for realizing an Ising machine with all-to-all spin couplings, based on adiabatic quantum computation in the Lechner-Hauke-Zoller (LHZ) scheme. However its performance has been evaluated for only a few KPOs. By numerically simulating more... Read more
Published on: 2020-05-29
Exceptional points (EPs), the degeneracy point of non-Hermitian systems, have recently attracted great attention after its ability to greatly enhance the sensitivity of micro-cavities is demonstrated experimentally. Unlike the usual degeneracies in Hermitian systems, at EPs, both the eigenenergies and eigenvectors coalesce. Although some of the exotic properties and potential... Read more
Published on: 2020-05-29
Compact and robust ion traps for thorium are enabling technology for the next generation of atomic clocks based on a low-lying nuclear transition in thorium-229 atoms. We aim to study a laser ablation loading process for single thorium ions in a radio-frequency electromagnetic trap. We use a linear Paul trap... Read more
Published on: 2020-05-29
We show that highly confined superfluid films are extremely nonlinear mechanical resonators, offering the prospect to realize a mechanical qubit. Specifically, we consider third-sound surface waves, with nonlinearities introduced by the van der Waals interaction with the substrate. Confining these waves to a disk, we derive analytic expressions for the... Read more
Published on: 2020-05-29
Entanglement of formation is a fundamental measure that quantifies the entanglement of bipartite quantum states. This measure has recently been extended into multipartite states taking the name $alpha$-entanglement of formation. In this work, we follow an analogous multipartite extension for the Gaussian version of entanglement of formation, and focusing on... Read more
Published on: 2020-05-29
Recent quantum technologies utilize complex multidimensional processes that govern the dynamics of quantum systems. We develop an adaptive diagonal-element-probing compression technique that feasibly characterizes any unknown quantum processes using much fewer measurements compared to conventional methods. This technique utilizes compressive projective measurements that are generalizable to arbitrary number of subsystems.... Read more
Published on: 2020-05-29
This article considers quantum systems described by a finite-dimensional complex Hilbert space $H$. We first define the concept of a finite observable on $H$. We then discuss ways of combining observables in terms of convex combinations, post-processing and sequential products. We also define complementary and coexistent observables. We then introduce... Read more
Published on: 2020-05-29
The single-particle spectral function of a strongly correlated system is an essential ingredient to describe its dynamics and transport properties. We develop a general method to calculate the exact spectral function of a strongly interacting one-dimensional Bose gas in the Tonks-Girardeau regime, valid for any type of confining potential, and... Read more
Published on: 2020-05-29
Consider a sequence in a finite-dimensional complex (resp. real) vector space arising as the iterates of an arbitrary point under the composition of a unitary (resp. orthogonal) map with the orthogonal projection on the hyperplane orthogonal to the starting point. We show that, generically, the series of the squared norms... Read more
Published on: 2020-05-29