Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Zhdanov, Dmitry V."'
Publikováno v:
Physical Review A 108, 052208 (2023)
The choice of mathematical representation when describing physical systems is of great consequence, and this choice is usually determined by the properties of the problem at hand. Here we examine the little-known wave operator representation of quant
Externí odkaz:
http://arxiv.org/abs/2302.13208
Autor:
Zhdanov, Dmitry V., Bondar, Denys I.
We show that the dynamics of a closed quantum system obeys the Hamilton variation principle. Even though quantum particles lack well-defined trajectories, their evolution in the Husimi representation can be treated as a flow of multidimensional proba
Externí odkaz:
http://arxiv.org/abs/2111.07554
Autor:
Zhdanov, Dmitry V., Bondar, Denys I.
The family of trajectories-based approximations employed in computational quantum physics and chemistry is very diverse. For instance, Bohmian and Heller's frozen Gaussian semiclassical trajectories seem to have nothing in common. Based on a hydrodyn
Externí odkaz:
http://arxiv.org/abs/2007.14691
Autor:
Zhdanov, Dmitry V.
We analyze a recent claim that almost all closed, finite dimensional quantum systems have trap-free (i.e., free from local optima) landscapes (B. Russell et.al. J. Phys. A: Math. Theor. 50, 205302 (2017)). We point out several errors in the proof whi
Externí odkaz:
http://arxiv.org/abs/1811.01416
Publikováno v:
Phys. Rev. A 98, 042133 (2018)
A quantum analog of friction (understood as a completely positive, Markovian, translation-invariant and phenomenological model of dissipation) is known to be in odds with the detailed balance in the thermodynamic limit. We show that this is not the c
Externí odkaz:
http://arxiv.org/abs/1810.00614
Autor:
Zhdanov, Dmitry V.
Why does controlling quantum phenomena appear easy to achieve? Why do effective quantum controls appear easy to find? Why is chemical synthesis and property optimization easier than expected? How to explain the commonalities across the optimal contro
Externí odkaz:
http://arxiv.org/abs/1710.07753
Autor:
Zhdanov, Dmitry V., Seideman, Tamar
Using the Pontryagin maximum principle, the generic structure of optimal policies is deduced for typical quantum control tasks involving coherent lasers, magnetic fields and reservoir engineering. In addition, the periodic optimization is considered
Externí odkaz:
http://arxiv.org/abs/1709.09423
Publikováno v:
Phys. Rev. Lett. 119, 170402 (2017)
The proof of the long-standing conjecture is presented that Markovian quantum master equations are at odds with quantum thermodynamics under conventional assumptions of fluctuation-dissipation theorems (implying a translation invariant dissipation).
Externí odkaz:
http://arxiv.org/abs/1706.00341
We prove a generalization of the Lindblad's fundamental no-go result: A quantum system cannot be completely frozen and, in some cases, even thermalized via translationally invariant dissipation -- the quantum friction. Nevertheless, a practical metho
Externí odkaz:
http://arxiv.org/abs/1612.00573
Autor:
Vuglar, Shanon L., Zhdanov, Dmitry V., Cabrera, Renan, Seideman, Tamar, Jarzynski, Christopher, Bondar, Denys I.
Publikováno v:
Phys. Rev. Lett. 120, 230404 (2018)
A systematic approach is given for engineering dissipative environments that steer quantum wavepackets along desired trajectories. The methodology is demonstrated with several illustrative examples: environment-assisted tunneling, trapping, effective
Externí odkaz:
http://arxiv.org/abs/1611.02736