Optics Letters,
Journal Year:
2024,
Volume and Issue:
50(3), P. 722 - 722
Published: Dec. 12, 2024
Employing
an
optical
microcavity
interacting
with
a
nitrogen-vacancy
(NV)
center
excellent
performance
and
scalability,
two
logic-qubit
controlled-not
(CNOT)
gates
in
decoherence-free
subspaces
(DFSs)
are
successfully
constructed
against
collective-rotating
noise
collective-dephasing
noise,
respectively.
The
circuit
has
heralded
function
that
can
filter
out
incorrect
components.
Furthermore,
waveform
corrector
(WFC)
is
adopted
to
balance
the
amplitude
of
components
different
spatial
modes,
thereby
achieving
high
fidelity.
Optics Letters,
Journal Year:
2025,
Volume and Issue:
50(4), P. 1113 - 1113
Published: Jan. 7, 2025
High-dimensional
quantum
gates
not
only
extend
the
existing
computing
framework
but
also
serve
as
a
vital
component
in
range
of
technologies.
In
study,
4
×
4-dimensional
controlled-NOT
(CNOT)
gate
is
presented
based
on
assistance
weak
cross-Kerr
medium,
utilizing
two
degrees
freedom
(DoFs)
with
photons.
Specifically,
control
qudits
are
encoded
photonic
polarization
DoF,
while
target
path
DoF
Notably,
circuit
constructed
using
times
Kerr
outperforming
previous
design
that
required
six
times,
which
simplifies
entire
circuits.
Furthermore,
fidelity
and
success
probability
proposed
protocol
near
1
when
influence
factors
take
appropriate
value.
Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: Jan. 20, 2025
As
the
hyperentanglement
of
photon
systems
holds
lots
remarkable
applications
for
enhancing
channel
capacity
with
less
quantum
resource,
interconversion
various
hyperentangled
states
warrants
in-depth
investigation
and
becomes
a
vital
work
information
technologies.
Here
we
realize
completely
mutual
conversions
between
spatial-polarization
Knill-Laflamme-Milburn
state
W
three-photon
systems,
resorting
to
hyperparallel
control
gates
practical
nonlinear
interaction
nitrogen-vacancy
centers
coupled
whispering-gallery-mode
microresonators.
The
gates,
i.e.,
controlled-not
controlled-swap
are
fundamental
prerequisites
realizing
interconversions
two
in
deterministic
way.
fidelities
these
conversion
processes
robust
their
efficiencies
also
high
due
fewer
interactions
errors
heralded
by
response
detectors,
which
intensify
comprehending
properties
hyperentanglement.
Advanced Quantum Technologies,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 14, 2025
Abstract
Quantum
logic
gate
forms
the
cornerstone
of
quantum
computing.
Here,
two
error‐detected,
circuit‐compact,
and
fidelity‐robust
SWAP
(SWAP)
()
gates
are
set
for
quantum‐dot
(QD)
spins
with
aid
scattering
property
photon
off
QD
fixed
in
double‐sided
microcavity.
For
an
ideal
single‐photon
scattering,
efficiencies
fidelities
both
can,
principle,
be
close
to
unity.
Otherwise,
being
directed
against
a
nonideal
error‐detected
units
make
their
near
perfect
at
expense
slight
reductions
efficiencies.
Moreover,
work
way
may
experimentally
feasible
current
technique
on
regulating
QD‐cavity
system.
Further,
additional
spin
qubits
not
required,
thereby
reducing
resource
usages
error
rates.
Annalen der Physik,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 2, 2025
Abstract
With
the
assistance
of
practical
nonlinear
interaction
a
nitrogen‐vacancy
(NV)
center
coupled
with
whispering‐gallery‐mode
(WGM)
microresonator,
heralded
preparation
protocol
four‐qubit
hybrid
decoherence‐free
states
(logical
qubits)
is
presented,
where
single
logical
qubit
encoded
on
state
system
composed
two
polarization
photons
and
NV
centers
fully
protected
against
collective
decoherence.
Compared
three‐qubit
states,
have
higher
dimensions,
stronger
decoherence
resistance,
richer
quantum
coherence
fault
tolerance.
For
an
ideal
photon‐NV
interaction,
efficiencies
fidelities
can,
in
principle,
be
close
to
unity.
Otherwise,
being
directed
nonideal
error‐heralded
blocks
process
make
their
near‐perfect
at
expense
slight
reductions
efficiencies.
Moreover,
this
work
way
may
experimentally
feasible
current
technique
regulating
NV‐WGM
microresonator
system.
Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: April 1, 2025
Abstract
In
quantum
computing,
characterizing
the
full
noise
profile
of
qubits
can
aid
in
increasing
coherence
times
and
fidelities
by
developing
error-mitigating
techniques
specific
to
present.
This
characterization
also
supports
efforts
advancing
device
fabrication
remove
sources
noise.
Qubit
properties
be
subject
non-trivial
correlations
space
time,
for
example,
spin
MOS
dots
are
exposed
originating
from
complex
glassy
behavior
two-level
fluctuator
ensembles.
Engineering
progress
qubit
experiments
generates
large
amounts
data,
necessitating
analysis
fields
experienced
managing
data
sets.
Fields
such
as
astrophysics,
finance,
climate
science
use
wavelet-based
methods
enhance
their
analysis.
Here,
we
propose
demonstrate
decompose
signals
into
frequency
time
components,
enhancing
our
understanding
systems
identifying
features
at
times.
We
apply
a
state-of-the-art
two-qubit
experiment
pair
SiMOS
with
feedback
applied
relevant
operation
variables.
The
observed
serve
identify
common
microscopic
causes
noise,
fluctuators
hyperfine
coupled
nuclei,
well
elucidate
pathways
multi-qubit
more
scalable
systems.
Advanced Quantum Technologies,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 8, 2025
Abstract
Employing
high‐dimensional
photonic
encodings
(qudits)
instead
of
the
traditional
2D
(qubits)
can
significantly
enhance
loss
tolerance
and
reduce
computational
resources
in
photon‐based
quantum
information
technology
(QIT).
To
tap
into
this
potential,
effective
schemes
for
generation
entangled
states
are
essential.
In
study,
two
arbitrary
4D
entanglement
protocols
based
on
cross‐Kerr
effect
developed,
including
two‐qudit
with
photon
pairs
three‐qudit
three
pairs.
These
require
neither
auxiliary
photons
(or
states)
nor
complicated
circuits.
The
success
probabilities
close
to
1
their
fidelities
robust
against
current
technology.
depend
only
simple
linear‐optics
elements,
available
four‐dimensional
single‐qudit
operations,
mature
measurement
methods,
making
our
proposed
feasible
efficient
practical
QIT.
Laser Physics Letters,
Journal Year:
2024,
Volume and Issue:
21(9), P. 095205 - 095205
Published: Aug. 21, 2024
Abstract
Entanglement
concentration
stands
as
a
pivotal
technique
to
safeguard
against
degraded
fidelity
in
long-distance
quantum
communication.
In
this
manuscript,
propose
ultra-efficient
entanglement
protocols
(ECPs)
tailored
for
less-entangled
two-photon
cluster
states
and
four-photon
with
two
unknown
parameters,
leveraging
simple
linear
optical
elements
acute
single-photon
detectors.
Additionally,
ancillary
photons,
post-selection
techniques,
or
photon-number-resolving
detectors
are
unnecessary
complete
identification
of
the
parity-check
measurement.
By
coordinating
auxiliary
time
degrees
freedom
implementing
multiple
recycling
conditions,
success
ECPs
can
be
heralded
by
detection
signatures
without
compromising
incident
qubits,
thereby
allowing
their
efficiencies
close
0.75,
principle.
The
combination
basic
renders
our
practical
accessible
experimental
exploration
current
technology.
Laser Physics,
Journal Year:
2024,
Volume and Issue:
34(11), P. 115203 - 115203
Published: Oct. 4, 2024
Abstract
The
distribution
of
maximal
entanglement
stands
as
a
pivotal
technique
in
long-distance
practical
quantum
communication.
Specifically,
achieving
high-fidelity
leans
upon
efficacious
purification
and
concentration.
In
this
paper,
we
materialize
error-rejecting
nonlocal
protocol
(EPP)
concentration
(ECP)
for
solid-state
emitter
systems
assisted
by
the
scattering
property
photon-emitter
one-dimensional
waveguide.
parity-check
gates
both
EPP
ECP
can
herald
faulty
events
with
help
detectors
that
click,
so
they
are
accomplished,
principle,
unity
fidelities,
which
conducive
to
implement
two
protocols.
Moreover,
additional
emitters
unnecessary
except
single
photon.
