215 research outputs found
Solubilities of nitrogen, oxygen, and argon in distilled water
The solubilities of nitrogen, oxygen and argon in distilled water in the temperature range 2-27°C have been measured with an estimated accuracy approaching 0.1%. Both absolute and solubility ratio techniques were employed. Tabulations are presented and interrelationships among the results are noted
Hardware implementation of quantum stabilizers in superconducting circuits
Stabilizer operations are at the heart of quantum error correction and are
typically implemented in software-controlled entangling gates and measurements
of groups of qubits. Alternatively, qubits can be designed so that the
Hamiltonian corresponds directly to a stabilizer for protecting quantum
information. We demonstrate such a hardware implementation of stabilizers in a
superconducting circuit composed of chains of -periodic Josephson
elements. With local on-chip flux- and charge-biasing, we observe a softening
of the energy band dispersion with respect to flux that is exponential in the
number of frustrated plaquette elements, in close agreement with our numerical
modeling.Comment: 6+30 pages, 4+18 figures, 0+6 tables, published versio
Numerical simulation of the thermal fragmentation process in fullerene C60
The processes of defect formation and annealing in fullerene C60 at
T=(4000-6000)K are studied by the molecular dynamics technique with a
tight-binding potential. The cluster lifetime until fragmentation due to the
loss of a C2 dimer has been calculated as a function of temperature. The
activation energy and the frequency factor in the Arrhenius equation for the
fragmentation rate have been found to be Ea = (9.2 +- 0.4) eV and A = (8 +-
1)10^{19} 1/s. It is shown that fragmentation can occur after the C60 cluster
loses its spherical shape. This fact must be taken into account in theoretical
calculations of Ea.Comment: 12 pages, 3 figure
Electrically tunable organic-inorganic hybrid polaritons with monolayer WS2.
Exciton-polaritons are quasiparticles consisting of a linear superposition of photonic and excitonic states, offering potential for nonlinear optical devices. The excitonic component of the polariton provides a finite Coulomb scattering cross section, such that the different types of exciton found in organic materials (Frenkel) and inorganic materials (Wannier-Mott) produce polaritons with different interparticle interaction strength. A hybrid polariton state with distinct excitons provides a potential technological route towards in situ control of nonlinear behaviour. Here we demonstrate a device in which hybrid polaritons are displayed at ambient temperatures, the excitonic component of which is part Frenkel and part Wannier-Mott, and in which the dominant exciton type can be switched with an applied voltage. The device consists of an open microcavity containing both organic dye and a monolayer of the transition metal dichalcogenide WS2. Our findings offer a perspective for electrically controlled nonlinear polariton devices at room temperature
Thermal stability of cubane C8H8
The reasons for the anomalously high thermal stability of cubane C8H8 and the
mechanisms of its decomposition are studied by numerically simulating the
dynamics of this metastable cluster at T = 1050 - 2000 K using a tight-binding
potential. The decomposition activation energy is found from the temperature
dependence of the cubane lifetime obtained from the numerical experiment; this
energy is fairly high, Ea = 1.8 - 2.0 eV. The decomposition products are, as a
rule, either C6H6 and C2H2 molecules or the isomer C8H8 with a lower energy.Comment: 5 figure
Phase transition in Random Circuit Sampling
Quantum computers hold the promise of executing tasks beyond the capability
of classical computers. Noise competes with coherent evolution and destroys
long-range correlations, making it an outstanding challenge to fully leverage
the computation power of near-term quantum processors. We report Random Circuit
Sampling (RCS) experiments where we identify distinct phases driven by the
interplay between quantum dynamics and noise. Using cross-entropy benchmarking,
we observe phase boundaries which can define the computational complexity of
noisy quantum evolution. We conclude by presenting an RCS experiment with 70
qubits at 24 cycles. We estimate the computational cost against improved
classical methods and demonstrate that our experiment is beyond the
capabilities of existing classical supercomputers
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