arXiv (Cornell University),
Journal Year:
2023,
Volume and Issue:
unknown
Published: Jan. 1, 2023
Dynamical
decoupling
has
been
shown
to
be
effective
in
reducing
gate
errors
most
quantum
computation
platforms
and
is
therefore
projected
play
an
essential
role
future
fault-tolerant
constructions.
In
superconducting
circuits,
however,
it
proven
difficult
utilize
the
benefits
of
dynamical
decoupling.
this
work,
we
present
a
theoretical
proposal
that
incorporates
continuous
version
decoupling,
namely
spin
locking,
with
coupler-based
CZ
for
transmons
provide
analytical
numerical
results
demonstrate
its
effectiveness.
Chemical Reviews,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 4, 2025
Accurate
models
for
open
quantum
systems─quantum
states
that
have
nontrivial
interactions
with
their
environment─may
aid
in
the
advancement
of
a
diverse
array
fields,
including
computation,
informatics,
and
prediction
static
dynamic
molecular
properties.
In
recent
years,
algorithms
been
leveraged
computation
systems
as
predicted
advantage
devices
over
classical
ones
may
allow
previously
inaccessible
applications.
Accomplishing
this
goal
will
require
input
expertise
from
different
research
perspectives,
well
training
workforce,
making
compilation
current
methods
treating
both
useful
timely.
Review,
we
first
provide
succinct
summary
fundamental
theory
then
delve
into
discussion
on
algorithms.
We
conclude
pertinent
applications,
demonstrating
applicability
field
to
realistic
chemical,
biological,
material
systems.
Physical Review Letters,
Journal Year:
2025,
Volume and Issue:
134(9)
Published: March 3, 2025
In
the
relentless
pursuit
of
quantum
computational
advantage,
we
present
a
significant
advancement
with
development
Zuchongzhi
3.0.
This
superconducting
computer
prototype,
comprising
105
qubits,
achieves
high
operational
fidelities,
single-qubit
gates,
two-qubit
and
readout
fidelity
at
99.90%,
99.62%,
99.13%,
respectively.
Our
experiments
an
83-qubit,
32-cycle
random
circuit
sampling
on
3.0
highlight
its
superior
performance,
achieving
1×10^{6}
samples
in
just
few
hundred
seconds.
task
is
estimated
to
be
infeasible
most
powerful
classical
supercomputers,
Frontier,
which
would
require
approximately
5.9×10^{9}
yr
replicate
task.
leap
processing
power
places
simulation
cost
6
orders
magnitude
beyond
Google's
SYC-67
SYC-70
[Morvan
et
al.,
Nature
634,
328
(2024)10.1038/s41586-024-07998-6],
firmly
establishing
new
benchmark
advantage.
work
not
only
advances
frontiers
computing
but
also
lays
groundwork
for
era
where
processors
play
essential
role
tackling
sophisticated
real-world
challenges.
The Journal of Physical Chemistry Letters,
Journal Year:
2025,
Volume and Issue:
unknown, P. 1855 - 1864
Published: Feb. 14, 2025
Bosonic
quantum
devices,
which
utilize
harmonic
oscillator
modes
to
encode
information,
are
emerging
as
a
promising
alternative
conventional
qubit-based
especially
for
the
simulation
of
vibrational
dynamics
and
spectroscopy.
We
present
framework
digital
under
anharmonic
potentials
on
these
bosonic
devices.
In
our
approach,
Hamiltonian
is
decomposed
into
solvable
fragments
that
can
be
used
currently
available
hardware.
Specifically,
we
have
extended
Cartan
subalgebra
approach
[Yen,
T.C.;
Izmaylov,
A.
F.
PRX
Quantum
2,
2021;
040320]-
method
decomposing
Hamiltonians
parts-
operators,
enabling
us
construct
efficiently
diagonalized
using
Bogoliubov
transforms.
The
tested
tunneling
in
model
two-dimensional
double-well
potential
calculations
eigenenergies
small
molecules.
Our
fragmentation
scheme
provides
new
simulations
hardware
multimode
dynamics.
Applied Physics Letters,
Journal Year:
2024,
Volume and Issue:
124(8)
Published: Feb. 19, 2024
With
its
rich
dynamics,
the
quantum
harmonic
oscillator
is
an
innate
platform
for
understanding
real-world
systems
and
could
even
excel
as
heart
of
a
computer.
A
particularly
promising
rapidly
advancing
that
harnesses
oscillators
information
processing
bosonic
circuit
electrodynamics
(cQED)
system.
In
this
article,
we
provide
perspectives
on
progress,
challenges,
future
directions
in
building
cQED
We
describe
main
hardware
blocks
how
they
facilitate
error
correction,
metrology,
simulation.
conclude
with
our
views
key
challenges
lie
horizon,
well
scientific
cultural
strategies
overcoming
them
practical
computer
hardware.
Quantum,
Journal Year:
2024,
Volume and Issue:
8, P. 1259 - 1259
Published: Feb. 20, 2024
Conical
intersections
are
topologically
protected
crossings
between
the
potential
energy
surfaces
of
a
molecular
Hamiltonian,
known
to
play
an
important
role
in
chemical
processes
such
as
photoisomerization
and
non-radiative
relaxation.
They
characterized
by
non-zero
Berry
phase,
which
is
topological
invariant
defined
on
closed
path
atomic
coordinate
space,
taking
value
π
when
encircles
intersection
manifold.
In
this
work,
we
show
that
for
real
Hamiltonians,
phase
can
be
obtained
tracing
local
optimum
variational
ansatz
along
chosen
estimating
overlap
initial
final
state
with
control-free
Hadamard
test.
Moreover,
discretizing
into
xmlns:mml="http://www.w3.org/1998/Math/MathML">N
points,
use
single
Newton-Raphson
steps
update
our
non-variationally.
Finally,
since
only
take
two
discrete
values
(0
or
xmlns:mml="http://www.w3.org/1998/Math/MathML">π),
procedure
succeeds
even
cumulative
error
bounded
constant;
allows
us
bound
total
sampling
cost
readily
verify
success
procedure.
We
demonstrate
numerically
application
algorithm
small
toy
models
formaldimine
molecule
(H2C=NH).
The Journal of Physical Chemistry Letters,
Journal Year:
2023,
Volume and Issue:
14(32), P. 7256 - 7263
Published: Aug. 9, 2023
Calculating
observable
properties
of
chemical
systems
is
often
classically
intractable
and
widely
viewed
as
a
promising
application
quantum
information
processing.
Here,
we
introduce
new
framework
for
solving
generic
dynamics
problems
using
logic.
We
experimentally
demonstrate
proof-of-principle
instance
our
method
the
QSCOUT
ion-trap
computer,
where
drive
system
to
emulate
wavepacket
corresponding
shared-proton
within
an
anharmonic
hydrogen
bonded
system.
Following
experimental
creation
propagation
on
ion-trap,
extract
measurement
observables
such
its
time-dependent
spatial
projection
characteristic
vibrational
frequencies
spectroscopic
accuracy
(3.3
cm–1
wavenumbers,
>99.9%
fidelity).
Our
approach
introduces
paradigm
studying
spectra
molecules
opens
possibility
describe
behavior
complex
molecular
processes
with
unprecedented
accuracy.
The Journal of Physical Chemistry Letters,
Journal Year:
2023,
Volume and Issue:
14(26), P. 6071 - 6077
Published: June 26, 2023
Electron
transfer
within
and
between
molecules
is
crucial
in
chemistry,
biochemistry,
energy
science.
This
study
describes
a
quantum
simulation
method
that
explores
the
influence
of
light
polarization
on
electron
two
molecules.
By
implementing
precise
coherent
control
among
states
trapped
atomic
ions,
we
can
induce
dynamics
mimic
electron-transfer
We
use
three-level
systems
(qutrits),
rather
than
traditional
two-level
(qubits),
to
enhance
efficiency
realize
high-fidelity
simulations
dynamics.
treat
interference
coupling
pathways
from
donor
with
degenerate
excited
an
acceptor
analyze
efficiency.
also
examine
potential
error
sources
enter
simulations.
The
trapped-ion
have
favorable
scalings
system
size
compared
those
classical
computers,
promising
access
richer
Journal of Chemical Theory and Computation,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 3, 2025
Quantum
harmonic
oscillators,
or
qumodes,
provide
a
promising
and
versatile
framework
for
quantum
computing.
Unlike
qubits,
which
are
limited
to
two
discrete
levels,
qumodes
have
an
infinite-dimensional
Hilbert
space,
making
them
well-suited
wide
range
of
simulations.
In
this
work,
we
focus
on
the
molecular
electronic
structure
problem.
We
propose
approach
map
Hamiltonian
into
qumode
bosonic
problem
that
can
be
solved
devices
using
variational
eigensolver
(VQE).
Our
is
demonstrated
through
computation
ground
potential
energy
surfaces
benchmark
model
systems,
including
H2
linear
H4
molecule.
The
preparation
trial
states
expectation
values
leverage
universal
ansatzes
based
echoed
conditional
displacement
(ECD),
selective
number-dependent
arbitrary
phase
(SNAP)
operations.
These
techniques
compatible
with
circuit
electrodynamics
(cQED)
platforms,
where
microwave
resonators
coupled
superconducting
transmon
qubits
offer
efficient
hardware
realization.
This
work
establishes
new
pathway
simulating
many-fermion
highlighting
hybrid
qubit-qumode
in
advancing
computational
chemistry.
The Journal of Chemical Physics,
Journal Year:
2025,
Volume and Issue:
162(13)
Published: April 1, 2025
We
offer
a
theoretical
perspective
on
simulation
and
engineering
of
polaritonic
conical-intersection-driven
singlet-fission
(SF)
materials.
begin
by
examining
fundamental
models,
including
Tavis–Cummings
Holstein–Tavis–Cummings
Hamiltonians,
exploring
how
disorder,
non-Hermitian
effects,
finite
temperature
conditions
impact
their
dynamics,
setting
the
stage
for
studying
conical
intersections
crucial
role
in
SF.
Using
rubrene
as
an
example
applying
numerically
accurate
Davydov
Ansatz
methodology,
we
derive
dynamic
spectroscopic
responses
system
demonstrate
key
mechanisms
capable
SF
manipulation,
viz.
cavity-induced
enhancement/weakening/suppression
SF,
population
localization
singlet
state
via
cavity-mode
excitation,
polaron/polariton
decoupling,
collective
enhancement
outline
unsolved
problems
challenges
field
share
our
views
development
future
lines
research.
emphasize
significance
careful
modeling
cascades
high
excitation
manifolds
envisage
that
geometric
phase
effects
may
remarkably
affect
dynamics
yield.
argue
microscopic
interpretation
main
regulatory
can
substantially
deepen
understanding
this
process,
thereby
providing
novel
ideas
solutions
improving
conversion
efficiency
photovoltaics.