53 research outputs found
Generalized Lindblad master equations in quantum reservoir engineering
Reservoir engineering has proven to be a practical approach to control open
quantum systems, preserving quantum coherence by appropriately manipulating the
reservoir and system-reservoir interactions. In this context, for systems
comprised of different parts, it is common to describe the dynamics of a
subsystem of interest by making an adiabatic elimination of the remaining
components of the system. This procedure often leads to an effective master
equation for the subsystem that is not in the well-known
Gorini-Kossakowski-Lindblad-Sudarshan form (here called standard Lindblad
form). Instead, it has a more general structure (here called generalized
Lindblad form), which explicitly reveals the dissipative coupling between the
various components of the subsystem. Moreover, for systems weakly coupled to a
reservoir, the presence of counter-rotating terms in the interaction
Hamiltonian or the nonstationarity of the reservoir state guarantees that the
master equation describing the system of interest will be of the generalized
Lindblad form. In this work, we present a set of dynamical equations for the
first and second moments of the canonical variables for linear systems, bosonic
and fermionic, described by generalized Lindblad master equations. Our method
is efficient and allows one to obtain analytical solutions for the steady
state. Further, we include as a review some covariance matrix methods for which
our results are particularly relevant, paying special attention to those
related to the measurement of entanglement. Finally, we prove that the Duan
criterion for entanglement is also applicable to fermionic systems.Comment: 14 pages, 2 figure
Synthesizing gas-filled fiber Raman lines enables access to the molecular fingerprint region
The synthesis of multiple narrow optical spectral lines, precisely and
independently tuned across the near- to mid-infrared (IR) region, is a pivotal
research area that enables selective and real-time detection of trace gas
species within complex gas mixtures. However, existing methods for developing
such light sources suffer from limited flexibility and very low pulse energy,
particularly in the mid-IR domain. Here, we introduce a new concept based on
the gas-filled anti-resonant hollow-core fiber (ARHCF) technology that enables
the synthesis of multiple independently tunable spectral lines with high pulse
energy of >1 {\mu}J and a few nanoseconds pulse width in the near- and mid-IR
region. The number and wavelengths of the generated spectral lines can be
dynamically reconfigured. A proof-of-concept laser beam synthesized of two
narrow spectral lines at 3.99 {\mu}m and 4.25 {\mu}m wavelengths is
demonstrated and combined with photoacoustic (PA) modality for real-time SO2
and CO2 detection. The proposed concept also constitutes a promising way for IR
multispectral microscopic imaging.Comment: 39 page
Timing of thoracic radiotherapy in the treatment of extensive-stage small-cell lung cancer: important or not?
The Role of the Height Fluctuation Effect in the Tunable Interfacial Electronic Structure of the Vertically Stacked BP/MoS2 Heterojunction
Toward a model of destination resident–environment relationship: the case of Gulangyu, China
Enhancement of Curie Temperature under Built-in Electric Field in Multi-Functional Janus Vanadium Dichalcogenides
Giant Gating Tunability of Optical Refractive Index in Transition Metal Dichalcogenide Monolayers
Functional mapping of rat brain activation following rTMS using activity-induced manganese-dependent contrast
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