arXiv (Cornell University),
Год журнала:
2021,
Номер
unknown
Опубликована: Сен. 21, 2021
We
show
how
to
robustly
violate
local
realism
within
the
weak$-$field
homodyne
measurement
scheme
for
any
superposition
of
one
photon
with
vacuum.
Our
setup
involves
tunable
beamsplitters
at
stations,
and
oscillator
fields
significantly
varying
between
settings.
As
number
resolving
measurements
are
now
feasible,
we
advocate
use
Clauser$-$Horne
Bell
inequalities
detection
events
using
precisely
defined
numbers
photons.
find
a
condition
optimal
settings
maximal
violation
Clauser-Horne
inequality
weak-field
detection,
which
states
that
reflectivity
beamsplitter
must
be
equal
strength
field.
this
holds
not
only
vacuum$--$one$-$photon
qubit
input
state,
but
also
Two$-$Mode
Squeezed
Vacuum
suggests
its
generality
as
property
photon-number
resolution.
findings
suggest
possible
path
employ
such
scenarios
in
device$-$independent
quantum
protocols.
Journal of Optics,
Год журнала:
2022,
Номер
24(8), С. 083001 - 083001
Опубликована: Июнь 20, 2022
Abstract
Multimode
devices
and
components
have
attracted
considerable
attention
in
the
last
years,
different
research
topics
themes
emerged
very
recently.
The
multimodality
can
be
seen
as
an
additional
degree
of
freedom
designing
devices,
thus
allowing
for
development
more
complex
sophisticated
components.
propagation
modes
used
to
increase
fiber
optic
capacity,
but
also
introduce
novel
intermodal
interactions,
well
manipulation
optical
a
variety
applications.
In
this
roadmap
we
would
like
give
readers
comprehensive
overview
most
recent
developments
field,
presenting
contributions
coming
from
topics,
including
technologies,
integrated
optics,
basic
physics
telecommunications.
Physical Review Letters,
Год журнала:
2021,
Номер
126(21)
Опубликована: Май 25, 2021
A
semi-device-independent
framework
for
prepare-and-measure
experiments
is
introduced
in
which
an
experimenter
can
tune
the
degree
of
distrust
performance
quantum
devices.
In
this
framework,
a
receiver
operates
uncharacterized
measurement
device
and
sender
preparation
that
emits
states
with
bounded
fidelity
respect
to
set
target
states.
No
assumption
on
Hilbert
space
dimension
required.
The
correlations
investigated
from
both
interior
exterior.
Furthermore,
optimal
state
discrimination
derived
applied
certification
detection
efficiency.
Quantum-over-classical
advantages
are
demonstrated
magnitude
compatible
such
explored.
Finally,
efficient
schemes
random
number
generation
developed.
Physical review. A/Physical review, A,
Год журнала:
2025,
Номер
111(4)
Опубликована: Апрель 30, 2025
High-dimensional
systems
are
an
important
frontier
for
photonic
quantum
correlation
experiments.
These
tests
commonly
prescribe
measurements
with
many
possible
outcomes
but
they
often
implemented
through
individual
binary-outcome
that
use
only
a
single-detector.
Here,
we
discuss
how
this
binarization
procedure
multioutcome
can
open
loophole,
unless
specific
device-characterization
assumptions
satisfied.
We
highlight
designed
be
trivialized
in
binarized
implementations
and
then
show
to
accurately
analyze
data
reveal
their
features.
For
seminal
types
of
experiments,
such
as
Bell
inequality
tests,
steering
prepare-and-measure
find
may
incur
sizable
cost
the
magnitude
advantages.
This
emphasizes
importance
both
accurate
analysis
implementing
genuinely
high-dimensional
Published
by
American
Physical
Society
2025
Physical Review Letters,
Год журнала:
2022,
Номер
129(25)
Опубликована: Дек. 16, 2022
Quantum
communication
is
often
investigated
in
scenarios
where
only
the
dimension
of
Hilbert
space
known.
However,
assigning
a
precise
an
approximation
what
actually
higher-dimensional
process.
Here,
we
introduce
and
investigate
quantum
information
encoded
carriers
that
nearly,
but
not
entirely,
correspond
to
standard
qudits.
We
demonstrate
relevance
this
concept
for
semi-device-independent
by
showing
how
small
components
can
significantly
compromise
conclusions
established
protocols.
Then
provide
general
method,
based
on
semidefinite
relaxations,
bounding
set
almost
qudit
correlations,
apply
it
remedy
demonstrated
issues.
This
method
also
offers
novel
systematic
approach
well-known
task
device-independent
tests
classical
dimensions
with
unentangled
devices.
Finally,
consider
viewing
qubit
systems
as
physical
resource
available
experimenter
determine
optimal
protocol
Random
Access
Code.
Physical Review Applied,
Год журнала:
2022,
Номер
18(3)
Опубликована: Сен. 27, 2022
Bell
nonclassicality
of
a
single
photon
superposition
in
two
modes,
often
referred
to
as
`nonlocality
photon',
is
one
the
most
striking
nonclassical
phenomena
discussed
context
foundations
quantum
physics.
Here
we
show
how
robustly
violate
local
realism
within
weak-field
homodyne
measurement
scheme
for
\textit{any}
with
vacuum.
Our
modification
previously
proposed
setups
involves
tunable
beamsplitters
at
stations,
and
oscillator
fields
significantly
varying
between
settings,
optimally
being
{\it
on}
or
off}.
As
number
resolving
measurements
are
now
feasible,
advocate
use
Clauser-Horne
inequalities
detection
events
using
precisely
defined
numbers
photons.
We
find
condition
optimal
settings
maximal
violation
inequality
detection,
which
states
that
reflectivity
beamsplitter
must
be
equal
strength
field.
this
holds
not
only
vacuum-one-photon
qubit
input
state,
but
also
pair
vacuum,
suggests
its
generality
property
photon-number
resolution.
findings
suggest
possible
path
employ
such
scenarios
device-independent
protocols.
Ann↦pmrandom
access
code
(RAC)
is
an
encoding
ofnbits
intombits
such
that
any
initial
bit
can
be
recovered
with
probability
at
leastp,
while
in
a
quantum
RAC
(QRAC),
themqubits.
Since
its
proposal,
the
idea
of
RACs
was
generalized
many
different
ways,
e.g.
allowing
use
shared
entanglement
(called
entanglement-assisted
random
code,
or
simply
EARAC)
recovering
multiple
bits
instead
one.
In
this
paper
we
generalize
to
value
given
Boolean
functionfon
subset
fixed
size
bits,
which
callf-random
codes.
We
study
and
give
protocols
forf-RAC)
xmlns:mml="http://www.w3.org/1998/Math/MathML">f-QRAC)
encoding,
together
resources,
private
randomness,
xmlns:mml="http://www.w3.org/1998/Math/MathML">f-EARAC)
Popescu-Rohrlich
boxes
xmlns:mml="http://www.w3.org/1998/Math/MathML">f-PRRAC).
The
success
our
characterized
by
xmlns:mml="http://www.w3.org/1998/Math/MathML">noise
stabilityof
xmlns:mml="http://www.w3.org/1998/Math/MathML">f.
Moreover,
anupper
boundon
anyf-QRAC
randomness
matches
up
multiplicative
constant
(andf-RACs
extension),
meaning
only
achieve
limited
advantage
over
their
counterparts.
