Science Advances,
Journal Year:
2022,
Volume and Issue:
8(40)
Published: Oct. 7, 2022
Quantum
autoencoders
serve
as
efficient
means
for
quantum
data
compression.
Here,
we
propose
and
demonstrate
their
use
to
reduce
resource
costs
teleportation
of
subspaces
in
high-dimensional
systems.
We
a
autoencoder
compress-teleport-decompress
manner
report
the
first
demonstration
with
qutrits
using
an
integrated
photonic
platform
future
scalability.
The
key
strategy
is
compress
dimensionality
input
states
by
erasing
redundant
information
recover
initial
after
chip-to-chip
teleportation.
Unsupervised
machine
learning
applied
train
on-chip
autoencoder,
enabling
compression
any
state
from
subspace.
Unknown
are
decompressed
at
high
fidelity
(~0.971),
obtaining
total
~0.894.
Subspace
encodings
hold
great
potential
they
support
enhanced
noise
robustness
increased
coherence.
Laying
groundwork
techniques
systems,
our
scheme
opens
previously
unidentified
paths
toward
computing
networking.
Advanced Quantum Technologies,
Journal Year:
2021,
Volume and Issue:
4(9)
Published: July 13, 2021
Quantum
coherence
is
a
fundamental
property
of
quantum
systems,
separating
from
classical
physics.
Recently,
there
has
been
significant
interest
in
the
characterization
as
resource,
investigating
how
can
be
extracted
and
used
for
technological
applications.
In
this
work
we
review
progress
research,
focusing
particular
on
recent
experimental
efforts.
After
brief
underlying
theory
discuss
main
platforms
realizing
experiments:
linear
optics,
nuclear
magnetic
resonance,
superconducting
systems.
We
then
consider
detection
quantification
coherence,
state
conversion
distillation,
experiments
dynamics
coherence.
also
exploring
connections
between
uncertainty
relations,
path
information,
operations
measurements.
Experimental
efforts
multipartite
multilevel
are
discussed.
Physical Review X,
Journal Year:
2021,
Volume and Issue:
11(2)
Published: April 9, 2021
The
theory
of
quantum
information
provides
a
common
language
which
links
disciplines
ranging
from
cosmology
to
condensed-matter
physics.
For
example,
the
delocalization
in
strongly-interacting
many-body
systems,
known
as
scrambling,
has
recently
begun
unite
our
understanding
black
hole
dynamics,
transport
exotic
non-Fermi
liquids,
and
analogs
chaos.
To
date,
verified
experimental
implementations
scrambling
have
dealt
only
with
systems
comprised
two-level
qubits.
Higher-dimensional
however,
may
exhibit
different
modalities
are
predicted
saturate
conjectured
speed
limits
on
rate
scrambling.
We
take
first
steps
toward
accessing
such
phenomena,
by
realizing
processor
based
superconducting
qutrits
(three-level
systems).
implement
two-qutrit
operations
embed
them
five-qutrit
teleportation
algorithm
directly
measure
associated
out
of-time-ordered
correlation
functions.
Measured
fidelities,
Favg
=
0.568
+-
0001,
confirm
occurrence
even
presence
imperfections.
Our
algorithm,
connects
recent
proposals
for
studying
traversable
wormholes
laboratory,
demonstrates
how
processing
technology
higher
dimensional
can
exploit
larger
more
connected
state
space
achieve
resource
efficient
encoding
complex
circuits.
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: Dec. 13, 2023
The
efficient
transport
and
engineering
of
photonic
orbital
angular
momentum
(OAM)
lie
at
the
heart
various
related
classical
quantum
applications.
Here,
by
leveraging
spatial-mode-engineered
frequency
conversion,
we
realize
remote
high-dimensional
states
between
two
distant
parties
without
direct
transmission
information
carriers.
We
exploit
perfect
vortices
for
preparing
yet
maximal
O
AM
entanglement.
Based
on
nonlinear
sum-frequency
generation
working
with
a
strong
coherent
wave
packet
single
photon,
conduct
Bell-like
state
measurements
vortices.
experimentally
achieve
an
average
fidelity
0.879
±
0.048
0.796
0.066
complete
set
3-dimensional
5-dimensional
OAM
mutually
unbiased
bases,
respectively.
Furthermore,
exploring
full
transverse
entanglement,
construct
another
strategy
imaging
interaction-free
light.
It
is
expected
that,
future
advances
in
our
scheme
will
pave
way
realizing
truly
secure
teleportation
upcoming
network.
Physical Review Applied,
Journal Year:
2023,
Volume and Issue:
20(1)
Published: July 10, 2023
Greenberger-Horne-Zeilinger
and
$W$
states
feature
genuine
tripartite
entanglement
that
cannot
be
converted
into
each
other
by
local
operations
classical
communication.
Here,
we
present
a
dissipative
protocol
for
deterministic
interconversion
between
of
three
neutral
${}^{87}\mathrm{Rb}$
atoms
arranged
in
an
equilateral
triangle
two-dimensional
array.
With
atomic
levels
diagonal
van
der
Waals
interactions
Rydberg
atoms,
the
entangled
can
efficiently
accomplished
Floquet-Lindblad
framework
through
periodic
optical
pump
dissipation
engineering.
We
evaluate
feasibility
existing
methodology
using
experimental
parameters
accessible
to
current
neutral-atom
platforms.
find
our
scheme
is
robust
against
typical
noises,
such
as
laser
phase
noise
geometric
imperfections
atom
In
addition,
integrate
Gaussian
soft
quantum
control
technique,
which
further
reduces
overall
conversion
time
increases
resilience
timing
errors
interatomic
distance
fluctuations.
The
high-fidelity
provides
route
save
physical
resources
enhance
computational
efficiency
networks
formed
arrays.
