1,984 research outputs found
Highly Efficient Creation and Detection of Deeply-bound Molecules via Invariant-based Inverse Engineering with Feasible Modified Drivings
Stimulated Raman Adiabatic Passage (STIRAP) and its variants, such as
multi-state chainwise-STIRAP allow efficiently transferring the populations in
multi-state system and have been widely used to prepare ultracold deeply-bound
molecules. However, their transfer efficiencies are generally imperfect. The
main obstacle is the presence of losses and the requirement to make the
dynamics adiabatic. To this end, in the present paper a theoretical method for
the efficient and robust creation and detection of deeply-bound molecules is
proposed. The simple three- and five-level systems with states chainwise
coupled by optical fields are considered. In the regime of large detuning, the
major molecular losses are pre-suppressed by reducing the dynamics of the
three- and five-level molecular systems to those of effective two- and
three-level counterparts, respectively. Consequently, two-level counterpart can
be directly compatible with two kinds of "Invariant-based Inverse Engineering"
(IIE) recipes, the results show that both protocols give comparable performance
and have good experimental feasibility. For the five-level case, by considering
a relation among the four incident pulses, we show that the M-type structure
can be generalized into an effective -type one with the simplest
resonant coupling. Therefore, this generalized model can also be directly
compatible with "IIE" recipe. Numerical calculations show that the weakly-bound
molecules can be efficiently transferred to their deeply-bound states without
strong laser intensity, and the stability against parameter variations is well
preserved. Finally, the detection of ultracold deeply-bound molecules is
discussed, the results show that all the protocols allow efficient detection of
molecules
The Influence of Culture on Attitudes Towards Humorous Advertising
open access articl
ΠΠ°ΠΊ ΠΏΡΠ΅ΠΎΠ΄ΠΎΠ»Π΅ΡΡ ΡΠ»ΡΡΠ°ΠΉ ΡΠ΅ΡΠ½ΠΎΠ³ΠΎ Π»Π΅Π±Π΅Π΄Ρ - Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΡΠ΅Π°Π³ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΌΠ°Π»ΡΡ ΠΈ ΡΡΠ΅Π΄Π½ΠΈΡ ΠΈΠΌΠΏΠΎΡΡΠ½ΡΡ ΠΈ ΡΠΊΡΠΏΠΎΡΡΠ½ΡΡ ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΉ Π² ΡΡΠ»ΠΎΠ²ΠΈΡΡ ΡΠΏΠΈΠ΄Π΅ΠΌΠΈΠΈ COVID-19
ΠΠΏΠΈΠ΄Π΅ΠΌΠΈΡ covid-19 (ΠΊΠ»Π°ΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΈΠ½ΡΠΈΠ΄Π΅Π½Ρ Ρ ΡΠ΅ΡΠ½ΡΠΌ Π»Π΅Π±Π΅Π΄Π΅ΠΌ), ΡΠ°Π·ΡΠ°Π·ΠΈΠ²ΡΠ°ΡΡΡ Π² 2019 Π³ΠΎΠ΄Ρ, ΠΏΠΎΠ²Π»ΠΈΡΠ»Π° Π½Π° Π΄Π΅ΡΡΠ΅Π»ΡΠ½ΠΎΡΡΡ ΠΌΠ½ΠΎΠ³ΠΈΡ
ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠΉ, Π·Π°Π½ΠΈΠΌΠ°ΡΡΠΈΡ
ΡΡ ΠΈΠΌΠΏΠΎΡΡΠΎΠΌ ΠΈ ΡΠΊΡΠΏΠΎΡΡΠΎΠΌ. ΠΠ²ΡΠΎΡ ΠΈΡΡΠ»Π΅Π΄ΡΠ΅Ρ ΡΠ°ΠΊΠΈΠ΅ ΠΈΠ½ΡΠΈΠ΄Π΅Π½ΡΡ, ΡΡΠΎΠ±Ρ ΡΠ½ΠΈΠ·ΠΈΡΡ Π±ΠΈΠ·Π½Π΅Ρ-ΡΠΈΡΠΊΠΈ ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠΈ
One-way multiple beam splitter designed by quantum-like shortcut-to-adiabatic passage
Based on the quantum mechanical "Shortcut-to-Adiabatic passage" (STAP), a
novel design for the efficient and robust multiple beam splitter is presented
in this paper. This multiple beam splitter consists of one input and output
waveguide channels, which are connected via a mediator waveguide (WG). To
implement "STAP" but without additional couplings, this -WG system is
first reduced to a controllable -WGs counterpart by "Morris-Shore" (MS)
transformation. Consequently, the reduced system can be directly compatible
with all possible "STAP" methods. The results show that this novel design can
achieve arbitrary ratio of multiple beam splitting and can significantly
shorten the length of the device, which expands the application of "STAP" in
classical system and provides a direct visualization in space of typical
ultra-fast phenomena in time. More uniquely, this new design exhibits a one-way
energy transport behavior. These may have profound impacts on exploring quantum
technologies for promoting advanced optical devices
Efficient Multi-Channel Speech Enhancement with Spherical Harmonics Injection for Directional Encoding
Multi-channel speech enhancement extracts speech using multiple microphones
that capture spatial cues. Effectively utilizing directional information is key
for multi-channel enhancement. Deep learning shows great potential on
multi-channel speech enhancement and often takes short-time Fourier Transform
(STFT) as inputs directly. To fully leverage the spatial information, we
introduce a method using spherical harmonics transform (SHT) coefficients as
auxiliary model inputs. These coefficients concisely represent spatial
distributions. Specifically, our model has two encoders, one for the STFT and
another for the SHT. By fusing both encoders in the decoder to estimate the
enhanced STFT, we effectively incorporate spatial context. Evaluations on TIMIT
under varying noise and reverberation show our model outperforms established
benchmarks. Remarkably, this is achieved with fewer computations and
parameters. By leveraging spherical harmonics to incorporate directional cues,
our model efficiently improves the performance of the multi-channel speech
enhancement.Comment: arXiv admin note: text overlap with arXiv:2309.1039
Personal Insolvency in China: Necessities, Difficulties, and Possibilities
There has long been demand for personal insolvency laws in China, yet such laws have hitherto been unavailable, in part due to ideological resistance. In more recent years there has been an increase in borrowing by individuals, which has led to increased calls for honest but unfortunate debtors to be able to obtain a fresh start. Yet there is significant public mistrust of defaulting debtors and in particular there is a shadow cast by those termed the Lao Lai that has led many to question the desirability of such a reform. There has also been a need for change in the development of an infrastructure to support a personal insolvency system, such as a social security, property registration and credit information systems, and although progress has been made in these regards there is still a need for further development. However, there has been case law progress in one province enabling collective resolutions of claims against insolvent debtors, and judicial guidance from senior courts has expanded on this. More recently, the COVID-19 pandemic has accelerated progress towards the enactment of personal insolvency laws on a local level in Shenzhen. This article considers the need for personal insolvency laws in China, identifies the obstacles that have hitherto stood in the way of such laws and discusses the momentum which has been recently gained towards the enactment of personal insolvency laws
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