Zobrazeno 1 - 10
of 85
pro vyhledávání: '"Niedenzu, Wolfgang"'
Publikováno v:
Phys. Rev. A 104, 042224 (2021)
Quantum thermodynamics often deals with the dynamics of small quantum machines interfacing with a large and complex environment. Virtual qubits, collisional models and reset master equations have become highly useful tools for predicting the qualitat
Externí odkaz:
http://arxiv.org/abs/2009.03832
Autor:
Hartmann, Andreas, Mukherjee, Victor, Mbeng, Glen Bigan, Niedenzu, Wolfgang, Lechner, Wolfgang
Publikováno v:
Quantum 4, 377 (2020)
Quantum refrigerators pump heat from a cold to a hot reservoir. In the few-particle regime, counter-diabatic (CD) driving of, originally adiabatic, work-exchange strokes is a promising candidate to overcome the bottleneck of vanishing cooling power.
Externí odkaz:
http://arxiv.org/abs/2008.09327
Publikováno v:
Phys. Rev. Research 3, 013173 (2021)
We study the zero-temperature quantum phase diagram for a two-component Bose-Einstein condensate in an optical cavity. The two atomic spin states are Raman coupled by two transverse orthogonally-polarized, blue detuned plane-wave lasers inducing a re
Externí odkaz:
http://arxiv.org/abs/2006.16582
Publikováno v:
Phys. Rev. Research 2, 023145 (2020)
Quantum heat engines are modeled by thermodynamic cycles with quantum-mechanical working media. Since high engine efficiencies require adiabaticity, a major challenge is to yield a nonvanishing power output at finite cycle times. Shortcuts to adiabat
Externí odkaz:
http://arxiv.org/abs/1912.08689
Publikováno v:
Phys. Rev. Lett. 124, 033601 (2020)
Atomic self-ordering to a crystalline phase in optical resonators is a consequence of the intriguing non-linear dynamics of strongly coupled atom motion and photons. Generally the resulting phase diagrams and atomic states can be largely understood o
Externí odkaz:
http://arxiv.org/abs/1907.02772
Publikováno v:
Quantum 3, 195 (2019)
One of the fundamental questions in quantum thermodynamics concerns the decomposition of energetic changes into heat and work. Contrary to classical engines, the entropy change of the piston cannot be neglected in the quantum domain. As a consequence
Externí odkaz:
http://arxiv.org/abs/1907.01353
Autor:
Bhattacharjee, Sourav, Bhattacharya, Utso, Niedenzu, Wolfgang, Mukherjee, Victor, Dutta, Amit
Publikováno v:
New J. Phys. 22 (2020) 013024
The precise estimation of small parameters is a challenging problem in quantum metrology. Here, we introduce a protocol for accurately measuring weak magnetic fields using a two-level magnetometer, which is coupled to two (hot and cold) thermal baths
Externí odkaz:
http://arxiv.org/abs/1905.09131
Publikováno v:
J. Phys. B: At. Mol. Opt. Phys. 52, 165003 (2019)
Atoms in spatially dependent light fields are attracted to local intensity maxima or minima depending on the sign of the frequency difference between the light and the atomic resonance. For light fields confined in open high-Q optical resonators the
Externí odkaz:
http://arxiv.org/abs/1902.05755
Publikováno v:
Quantum 3, 155 (2019)
We propose to implement a quantized thermal machine based on a mixture of two atomic species. One atomic species implements the working medium and the other implements two (cold and hot) baths. We show that such a setup can be employed for the refrig
Externí odkaz:
http://arxiv.org/abs/1812.08474
Publikováno v:
New J. Phys. 21 043019 (2019)
We explore the density and spin self-ordering of driven spin-$1/2$ collisionless fermionic atoms coupled to the electromagnetic fields of a ring resonator. The two spin states are two-photon Raman-coupled via a pair of degenerate counterpropagating c
Externí odkaz:
http://arxiv.org/abs/1812.01098