Optica Quantum,
Journal Year:
2023,
Volume and Issue:
1(1), P. 19 - 19
Published: Sept. 29, 2023
Parametric
sources
in
quantum
optics
usually
require
some
form
of
spectro-temporal
control
for
conditional
generation
high-purity
single-photon
states,
but
their
properties
have
not
yet
been
optimized
using
integrated
microchips.
Using
external
short-pulse
lasers
and
separate
devices
pump
preparation
photon
generation,
as
is
traditional,
incurs
many
impediments
such
reduced
performance,
increased
loss,
high
cost,
limited
scalability.
To
overcome
these
limitations,
here
we
demonstrate
a
circuit
including
high-bandwidth,
high-extinction
ratio
electro-optic
modulators
pump-pulse
fully
with
high-quality
factor
(
Q
)
microresonators
efficient
parametric
nonlinearity,
together
seamlessly
interconnecting
waveguides.
The
microchip
uses
different
optical
materials
on
common
platform
multi-layer
photonic
architecture.
this,
the
joint
spectrum
room-temperature
biphoton
first
time
single
microchip,
that
theoretical
purity
bound
can
be
achieved.
Nanophotonics,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 7, 2025
Abstract
Frequency-bin
encoding
furnishes
a
compelling
pathway
for
quantum
information
processing
systems
compatible
with
established
lightwave
infrastructures
based
on
fiber-optic
transmission
and
wavelength-division
multiplexing.
Yet
although
significant
progress
has
been
realized
in
proof-of-principle
tabletop
demonstrations,
ranging
from
arbitrary
single-qubit
gates
to
controllable
multiphoton
interference,
challenges
scaling
frequency-bin
processors
larger
remain.
In
this
Perspective,
we
highlight
recent
advances
at
the
intersection
of
integrated
photonics
that
are
fundamentally
transforming
outlook
scalable
frequency-based
information.
Focusing
specifically
results
sources,
state
manipulation,
hyperentanglement,
envision
possible
future
which
on-chip
circuits
fulfill
critical
roles
processing,
particularly
communications
networking.
Nanophotonics,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 20, 2025
Abstract
Quantum
dots
(QDs)
are
a
promising
source
of
single
photons
mainly
due
to
their
on-demand
operation.
However,
emission
wavelength
depends
on
size
and
immediate
surroundings
in
the
solid-state
environment.
By
applying
serrodyne
electro-optic
phase
modulation,
we
achieve
spectral
shift
up
0.01
nm
(3.5
GHz)
while
preserving
purity
indistinguishability
photons.
This
method
provides
an
efficient
scalable
approach
for
tuning
QDs
without
relying
nonlinear
frequency
mixing
or
probabilistic
processes.
Our
results
show
that
modulation
enables
stable
tunable
shifts,
making
it
suitable
applications
such
as
quantum
communication,
key
distribution,
primarily
integrating
remote
dot
sources
into
large-scale
networks.
Abstract
High‐performance
electro‐optic
(EO)
modulators
are
critical
components
in
modern
telecommunication
networks
and
intra‐datacenter
interconnects.
Low
driving
voltage,
wide
EO
bandwidth,
compact
device
size,
multi‐band
operation
capability
essential
for
various
application
scenarios,
particularly
energy‐efficient
high‐speed
data
transmission.
However,
it
is
challenging
to
meet
all
these
requirements
simultaneously.
Here,
a
high‐performance
dual‐band
thin‐film
lithium
niobate
modulator
with
low
dielectric
constant
(low‐k)
underfill
demonstrated
achieve
overall
performance
improvement.
The
low‐k
material
helps
reduce
the
RF
loss
of
perfect
velocity
matching
narrow
electrode
gap
overcome
voltage‐bandwidth
limitation,
extending
bandwidth
enhancing
modulation
efficiency
fabricated
7‐mm‐long
exhibits
half‐wave
voltage
V
π
1.9
C‐band
1.54
O‐band,
featuring
voltage‐length
product
1.33
1.08
V·cm,
respectively.
Meanwhile,
novel
design
yields
an
ultrawide
extrapolated
3
dB
220
GHz
(218
GHz)
(O‐band).
High‐speed
transmission
both
C‐
O‐bands
using
same
has
been
first
time
by
PAM8
rates
up
390
Gbit
s
−1
,
achieving
record‐low
energy
consumption
0.69
fJ
bit
next‐generation
cost‐effective
ultrahigh‐speed
optical
communications.
Research Square (Research Square),
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 2, 2025
Abstract
Quantum
light
sources
with
configurable
photon
lifetimes
are
essential
for
large-scale
quantum
circuits,
enabling
applications
in
programmable
computing,
various
key
distribution
protocols,
and
tomography
techniques.
However,
the
fundamental
trade-off
between
efficiency
lifetime
imposes
significant
challenges
on
design
of
high-performance
large
sources.
Here,
we
report
such
chip-scale
by
harnessing
unique
feature
parity-time
(PT)
symmetry.
The
core
centers
employing
PT-symmetric
coupling
two
microresonators
distinct
circumferences,
broad-range
selective
tuning
intracavity
density
states.
By
controlling
alignment
resonators,
achieved
a
38-fold
range
(4
~
158
ps),
shortest
near
exceptional
points
systems.
device
generates
energy-time
entangled
pairs
87.1
±
1.1%
interference
visibility
heralded
second-order
autocorrelation
𝑔ℎ(2)(0)=
35
0.069
0.001.
Our
work
highlights
potential
PT
symmetry
advanced
applications,
including
high-speed
communication
coherent
tomography,
beyond.
Optics Letters,
Journal Year:
2024,
Volume and Issue:
49(11), P. 2958 - 2958
Published: April 26, 2024
Mode
converters,
crucial
elements
within
photonic
integrated
circuits
(PICs)
designed
for
multimode
optical
transmission
and
switching
systems,
present
a
challenge
due
to
their
bulky
structures
in
thin-film
lithium
niobate
(TFLN)
platforms,
which
are
incompatible
with
the
compact
efficient
nature
desired
dense
PICs.
In
this
work,
we
propose
TE
Optica Quantum,
Journal Year:
2024,
Volume and Issue:
2(4), P. 282 - 282
Published: July 29, 2024
By
harnessing
multiple
degrees
of
freedom
(DoFs)
within
a
single
photon,
controlled
quantum
unitaries,
such
as
the
two-qubit
controlled-NOT
(
cnot
)
gate,
play
pivotal
role
in
advancing
communication
protocols
dense
coding
and
entanglement
distillation.
In
this
work,
we
devise
realize
operation
between
polarization
frequency
DoFs
by
exploiting
directionally
dependent
electro-optic
phase
modulation
fiber
Sagnac
loop.
Alongside
computational
basis
measurements,
validate
effectiveness
through
synthesis
all
four
Bell
states
with
fidelities
greater
than
98%.
This
demonstration
opens
new
avenues
for
manipulating
hyperentanglement
across
these
two
crucial
DoFs,
marking
foundational
step
toward
leveraging
polarization-frequency
resources
networks
future
applications.
Physical review. A/Physical review, A,
Journal Year:
2023,
Volume and Issue:
107(6)
Published: June 30, 2023
The
formation
of
a
Raman-induced
temporal
waveguide
is
demonstrated
by
launching
short
pump
and
probe
pulses
inside
photonic
crystal
fiber.
pulse
creates
fundamental
soliton
whose
speed
changes
continuously
owing
to
its
deceleration
through
the
red
shift
spectrum.
spectrum
blue-shifted
ensure
that
two
move
at
same
follow
trajectory
over
entire
length
output
wavelengths
depend
on
peak
power
input
their
measured
values
agree
with
predictions
based
dispersion
data.
Numerical
modeling
also
shows
good
agreement
experimental
results.
