Geometric phase is insensitive to certain local disturbances due to the
global properties accumulated through a closed loop in the parameter space. It
can be utilized to realize high-fidelity logic gates for geometric quantum
computing. Moveover in the degenerate subspace, non-Abelian geometric phase
leads to quantum holonomic gates. In this work, we propose a novel scheme for
holonomic gates using Rydberg atoms under the detuning-controllable drivings,
which can be considerably improved by the counterdiabatic method. In

Quantum droplets may form out of a gaseous Bose-Einstein condensate,
stabilized by quantum fluctuations beyond mean field. We show that multiple
singly-quantized vortices may form in these droplets at moderate angular
momenta in two dimensions. Droplets carrying these precursors of an Abrikosov
lattice remain self-bound for certain timescales after switching off an initial
harmonic confinement. Furthermore, we examine how these vortex-carrying
droplets can be formed in a more pertubation-resistant setting, by starting

Self-testing is a method to infer the underlying physics of a quantum
experiment in a black box scenario. As such it represents the strongest form of
certification for quantum systems. In recent years a considerable self-testing
literature has been developed, leading to progress in related
device-independent quantum information protocols and deepening our
understanding of quantum correlations. In this work we give a thorough and
self-contained introduction and review of self-testing and its application to

We study the dynamical behavior of nonlinear coupling in a quantum wave
equation of a logarithmic type. Using statistical mechanical arguments for a
large class of many-body systems, this coupling is shown to be related to
temperature which is a thermodynamic conjugate to the Everett-Hirschman's
quantum information entropy. A combined quantum-mechanical and
field-theoretical model is proposed, which leads to a logarithmic equation with
variable nonlinear coupling. We study its properties and present arguments

The quantum satellite is a cornerstone towards practical free-space quantum
network and overcomes the photon loss over large distance. However, challenges
still exist including real-time all-location coverage and multi-node
construction, which may be complemented by the diversity of modern drones. Here
we demonstrate the first drone-based entanglement distribution at all-weather
conditions over 200 meters (test field limited), and the
Clauser-Horne-Shimony-Holt S-parameter exceeds 2.49, within 35 kg take-off

We significantly reduce the cost of factoring integers and computing discrete
logarithms over finite fields on a quantum computer by combining techniques
from Griffiths-Niu 1996, Zalka 2006, Fowler 2012, Eker{\aa}-H{\aa}stad 2017,
Eker{\aa} 2017, Eker{\aa} 2018, Gidney-Fowler 2019, Gidney 2019. We estimate
the approximate cost of our construction using plausible physical assumptions
for large-scale superconducting qubit platforms: a planar grid of qubits with

Contextuality is a signature of operational nonclassicality in the outcome
statistics of an experiment. This notion of nonclassicality applies to a
breadth of physical phenomena. Here, we establish its relation to two
fundamental nonclassical entities in quantum theory; measurement
incompatibility and steering. We show that each is necessary and sufficient the
failure of operational contextuality. We exploit the established connection to
contextuality to provide a novel approach to problems in measurement

To achieve scalable quantum computing, improving entangling-gate fidelity and
its implementation-efficiency are of utmost importance. We present here a
linear method to construct provably power-optimal entangling gates on an
arbitrary pair of qubits on a trapped-ion quantum computer. This method
leverages simultaneous modulation of amplitude, frequency, and phase of the
beams that illuminate the ions and, unlike the state of the art, does not
require any search in the parameter space. The linear method is extensible,

Uncertainty relation is one of the fundamental principle in quantum mechanics
and plays an important role in quantum information science. We experimentally
test the error-disturbance uncertainty relation (EDR) with continuous variables
for Gaussian states. Two conjugate continuous-variable observables, amplitude
and phase quadratures of an optical mode, are measured simultaneously by using
a heterodyne measurement system. The EDR with continuous variables for a
coherent state, a squeezed state and a thermal state are verified

A conceptually simple model for strongly interacting compact U(1) lattice
gauge theory is expressed as operators acting on qubits. The number of
independent gauge links is reduced to its minimum through the use of Gauss's
law. The model can be implemented with any number of qubits per gauge link, and
a choice as small as two is shown to be useful. Real-time propagation and
real-time collisions are observed on lattices in two spatial dimensions. The
extension to three spatial dimensions is also developed, and a first look at