Physical review. D/Physical review. D.,
Год журнала:
2023,
Номер
108(7)
Опубликована: Окт. 31, 2023
Top
pairs
produced
at
the
Large
Hadron
Collider
exhibit
quantum
entanglement
of
their
spins
near
threshold
and
for
boosted,
central
$t\overline{t}$
pairs.
The
is
maintained
between
decay
products,
in
particular,
top
quark
${W}^{\ensuremath{-}}$
boson
from
antiquark
(or
vice
versa,
$\overline{t}$
${W}^{+}$)
certain
kinematical
regions.
Therefore,
production
provides
a
rare
opportunity
to
verify
spin
fermion
boson.
$tW$
can
be
probed
$7\ensuremath{\sigma}$
level
with
run
2
data
$5\ensuremath{\sigma}$
boosted
region
foreseen
3
luminosity.
In
addition,
two
$W$
bosons
$4\ensuremath{\sigma}$
LHC
3.
ACS Photonics,
Год журнала:
2024,
Номер
11(8), С. 3401 - 3411
Опубликована: Июль 29, 2024
A
central
challenge
in
the
emerging
field
of
free-electron
quantum
optics
is
to
achieve
strong
interaction
and
single-photon
nonlinearity
between
a
flying
free
electron
photonic
mode.
Existing
schemes
are
intrinsically
limited
by
diffraction,
which
puts
an
upper
bound
on
length
and,
therefore,
strength
coupling
nonlinearity.
Here,
we
propose
"free-electron
fibers":
effectively
one-dimensional
systems
where
electrons
copropagate
with
two
guided
modes.
The
first
mode
applies
ponderomotive
trap
electron,
removing
limitations
due
diffraction.
second
strongly
couples
enhanced
that
orders
magnitude
larger
than
previous
designs.
extended
lengths
enabled
our
scheme
allow
for
nonlinearities
mediated
electrons.
We
predict
novel
effects
system
such
as
deterministic
emission
nonlinear
multimode
dynamics.
Our
proposal
paves
way
toward
realization
heralded
macroscopic
nonclassical
light
generation,
sources,
gates
controlled
free-electron–photon
interactions.
ACS Nano,
Год журнала:
2024,
Номер
18(22), С. 14255 - 14275
Опубликована: Май 22, 2024
Free
electrons
are
excellent
tools
to
probe
and
manipulate
nanoscale
optical
fields
with
emerging
applications
in
ultrafast
spectromicroscopy
quantum
metrology.
However,
advances
this
field
hindered
by
the
small
probability
associated
excitation
of
single
modes
individual
free
electrons.
Here,
we
theoretically
investigate
scaling
properties
electron-driven
for
a
wide
variety
including
plasmons
metallic
nanostructures
Mie
resonances
dielectric
cavities,
spanning
broad
spectral
range
that
extends
from
ultraviolet
infrared
region.
The
highest
probabilities
direct
generation
three-dimensionally
confined
observed
at
low
electron
mode
energies
structures,
order-unity
(∼100%)
coupling
demanding
use
<100
eV
interacting
polaritons
down
tens
nanometers
space.
Electronic
transitions
artificial
atoms
also
emerge
as
practical
systems
realize
strong
few-eV
In
contrast,
conventional
cavities
reach
maximum
few-percent
range.
addition,
show
waveguide
can
be
generated
higher-than-unity
efficiency
phase-matched
interaction
grazing
electrons,
suggesting
method
create
multiple
excitations
localized
an
through
funneling
so-generated
propagating
photons
into
confining
cavity─an
alternative
approach
electron–cavity
interaction.
Our
work
provides
roadmap
optimize
electron–photon
potential
well
nonlinear
optics
nanoscale.
Advances in Optics and Photonics,
Год журнала:
2022,
Номер
14(4), С. 862 - 862
Опубликована: Окт. 5, 2022
Dielectric
laser
accelerators
(DLAs)
are
fundamentally
based
on
the
interaction
of
photons
with
free
electrons,
where
energy
and
momentum
conservation
satisfied
by
mediation
a
nanostructure.
In
this
scheme,
photonic
nanostructure
induces
near-fields
which
transfer
from
photon
to
electron,
similar
inverse-Smith–Purcell
effect
described
in
metallic
gratings.
This,
turn,
may
provide
ground-breaking
applications,
as
it
is
technology
promising
miniaturize
particle
down
chip
scale.
This
fundamental
can
also
be
used
study
demonstrate
quantum
photon-electron
phenomena.
The
spontaneous
stimulated
Smith–Purcell
photon-induced
near-field
electron-microscopy
(PINEM)
have
evolved
fruitful
ground
for
observing
effects.
particular,
spectrum
electron
has
been
shown
discrete
peaks,
spaced
interacting
energy.
correlated
statistics
number
exchanges
that
took
place
during
interaction.
We
give
an
overview
DLA
PINEM
physics
focus
phase-space
manipulation.
Strong
coupling
in
light-matter
systems
is
a
central
concept
cavity
quantum
electrodynamics
and
essential
for
many
technologies.
Especially
the
optical
range,
full
control
of
highly
connected
multi-qubit
necessitates
coherent
probes
with
nanometric
spatial
resolution,
which
are
currently
inaccessible.
Here,
we
propose
use
free
electrons
as
high-resolution
sensors
strongly
coupled
systems.
Shaping
free-electron
wave
packet
enables
measurement
state
entire
hybrid
We
specifically
show
how
interference
gives
rise
to
quantum-enhanced
sensing
protocol
position
dipole
orientation
subnanometer
emitter
inside
cavity.
Our
results
showcase
great
versatility
applicability
interactions
between
cavities,
relying
on
unique
properties
interacting
flying
qubits
miniscule
dimensions.
Physical review. D/Physical review. D.,
Год журнала:
2023,
Номер
108(7)
Опубликована: Окт. 31, 2023
Top
pairs
produced
at
the
Large
Hadron
Collider
exhibit
quantum
entanglement
of
their
spins
near
threshold
and
for
boosted,
central
$t\overline{t}$
pairs.
The
is
maintained
between
decay
products,
in
particular,
top
quark
${W}^{\ensuremath{-}}$
boson
from
antiquark
(or
vice
versa,
$\overline{t}$
${W}^{+}$)
certain
kinematical
regions.
Therefore,
production
provides
a
rare
opportunity
to
verify
spin
fermion
boson.
$tW$
can
be
probed
$7\ensuremath{\sigma}$
level
with
run
2
data
$5\ensuremath{\sigma}$
boosted
region
foreseen
3
luminosity.
In
addition,
two
$W$
bosons
$4\ensuremath{\sigma}$
LHC
3.
