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Semion formalism for spin and qubit systems: Non-Markovian treatment
Physical Review A: Atomic, Molecular, and Optical physics. 2020. Vol. 102. No. 3. Article 042224.
Using semion substitution for spin variables we perform an ab initio derivation of effective action for an open quantum two-level system . For this purpose, we introduce, by using the Hubbard-Stratonovich transformation a two-time complex quantum field which average value plays the role of the Green's function for the spin variables. The field thus introduced allows us to develop a diagram technique in a standard way. The proposed formalism is used to study a spin embedded into an Ohmic reservoir as an example of the spin-boson model. Non-Markovian effects in this system are analyzed.
Yulia V. Vladimirova, Victor N. Zadkov, Nanomaterials 2021 Vol. 11 No. 8 Article 1919
This review is devoted to the study of effects of quantum optics in nanostructures. The mechanisms by which the rates of radiative and nonradiative decay are modified are considered in the model of a two-level quantum emitter (QE) near a plasmonic nanoparticle (NP). The distributions of the intensity and polarization of the near field around ...
Added: October 17, 2022
Zhukov A. A., Remizov S., Pogosov W. et al., JETP Letters 2018 Vol. 108 No. 1 P. 63-70
It has been shown that superconducting qubit systems, having high tunability, can be used as a platform for the experimental study of various effects of nonstationary quantum electrodynamics in a cavity. In particular, the dynamic Lamb effect can be implemented owing to a nonadiabatic change in the effective coupling between the subsystem of qubits and ...
Added: October 29, 2021
Alliluev A., Makarov D., Asriyan N. et al., Physics Letters A 2022 Vol. 453 Article 128492
Dynamics of exciton-polaritonic Bose-Einstein condensate is considered. We construct the stochastic Gross-Pitaevskii equation, where condensate is coupled to the excitonic reservoir in the non-Markovian regime. This equation is utilized for study of condensate formation. It is found that increasing of temperature results in transition from spatially uniform to fragmented pattern with onset of numerous vortices. ...
Added: October 24, 2022
Komrakova S., Javadzade J., Vorobyov V. et al., Journal of Physics: Conference Series 2018 Vol. 1124 No. 5 Article 051046
Here we studied the fabrication technique of a kilopixel array of nanodiamonds with
a nitrogen-vacancy color centers (NV) on top of the chip and measured the second-order
correlation function deep, clearly demonstrated the presence of single-photon sources. The
controlled position of nanodiamonds, determined from the measurement of second-order
correlation function was realized, as well as the yield of optimized ...
Added: April 28, 2021
Bracht T., Cosacchi M., Seidelmann T. et al., PRX Quantum 2021 Vol. 2 Article 040354
The controlled preparation of the excited state in a quantum emitter is a prerequisite for its usage as a single-photon source—a key building block for quantum technologies. In this paper, we propose a coherent excitation scheme using off-resonant pulses. In the usual Rabi scheme, these pulses would not lead to a significant occupation. This is ...
Added: February 22, 2022
Remizov S., Zhukov A. A., Shapiro D. et al., Physical Review A: Atomic, Molecular, and Optical physics 2017 Vol. 96 No. 4 Article 043870
We consider a dissipative evolution of a parametrically driven qubit-cavity system under the periodic modulation of coupling energy between two subsystems, which leads to the amplification of counter-rotating processes. We reveal a very rich dynamical behavior of this hybrid system. In particular, we find that the energy dissipation in one of the subsystems can enhance ...
Added: October 29, 2021
Fedorov G. P., Remizov S., Шапиро Д. С. et al., Physical Review Letters 2021 Vol. 126 Article 180503
We demonstrate nonequilibrium steady-state photon transport through a chain of five coupled artificial atoms simulating the driven-dissipative Bose-Hubbard model. Using transmission spectroscopy, we show that the system retains many-particle coherence despite being coupled strongly to two open spaces. We find that cross-Kerr interaction between system states allows high-contrast spectroscopic visualization of the emergent energy bands. ...
Added: October 29, 2021
Cygorek M., Cosacchi M., Vagov A. et al., Nature Physics 2022 Vol. 18 No. 6 P. 662-668
Studies of the dynamics of open quantum systems are limited by the large Hilbert space of typical environments, which is too large to be treated exactly. In some cases, approximate descriptions of the system are possible, for example, when the environment has a short memory time or only interacts weakly with the system. Accurate numerical ...
Added: May 21, 2022
Komrakova S., Javadzade J., Vorobyov V. et al., Journal of Physics: Conference Series 2019 Vol. 1410 Article 012180
Here we demonstrate CMOS compatible method to deterministically produce
nanoantenna with nanodiamonds systems on the example of a bull-eye antenna on top of on
hyperbolic metamaterials. We study the statistics of the placement of nanodiamonds and
measure the fluorescence lifetime and the second-order correlation function of NV-centers
inside nanodiamonds. ...
Added: April 28, 2021
Duplinskiy A., Sych D., Physical Review A: Atomic, Molecular, and Optical physics 2021 Vol. 104 No. 1 Article 012601
Passive side-channel attacks in quantum key distribution (QKD) aim at obtaining information about the quantum signals without disturbing them and hence compromise real-world QKD security. Currently, there are no reliable tools for the assessment of QKD signal generation imperfections. In this work we propose a generic experimental method which allows to upper-bound QKD light-source imperfections ...
Added: October 8, 2021
Boulatov A., Burin A., Journal of Chemical Physics 2020 Vol. 153 No. 13 P. 134102
The low temperature transport of electron, or vibrational or electronic exciton towards polymer chains turns out to be dramatically sensitive to its interaction with transverse acoustic vibrations. We show that this interaction leads to substantial polaron effect and decoherence, which are generally stronger than those associated with longitudinal vibrations. For site-dependent interactions transverse phonons form subohmic bath leading to ...
Added: October 14, 2020
Cosacchi M., Seidelmann T., Mielnik-Pyszczorski A. et al., Advanced Quantum Technologies 2022 Vol. 2 No. 100131 Article 2100131
Light trapping is a crucial mechanism for synchronization in optical communication. Especially on the level of single photons, control of the exact emission time is desirable. In this paper, a single-photon buffering device composed of a quantum dot doped with a single Mn atom in a cavity is theoretically proposed. A method to detain a ...
Added: February 22, 2022
Sergeev T. T., Zyablovsky A. A., Andrianov E. S. et al., Scientific Reports 2021 Vol. 11 Article 24054
We demonstrate a new type of non-Hermitian phase transition in open systems far from thermal equilibrium, which can have place in the absence of an exceptional point. This transition takes place in coupled systems interacting with reservoirs at different temperatures. We show that the spectrum of energy flow through the system caused by the temperature ...
Added: January 2, 2022
Aleiner I. L., Faoro L., Ioffe L., Annals of Physics 2016 Vol. 375 P. 378-406
We extend the Keldysh technique to enable the computation of out-of-time order correlators such as 〈O(t)Õ(0)O(t)Õ(0)〉. We show that the behavior of these correlators is described by equations that display initially an exponential instability which is followed by a linear propagation of the decoherence between two initially identically copies of the quantum many body systems ...
Added: October 21, 2016
Mokhnenko S., Овсянников В. Д., Мармо С. И. et al., Квантовая электроника 2017 Т. 47 № 5 С. 412
Разработка оптических стандартов частоты с относительной неопределенностью воспроизведения единиц времени и частоты 10-17 – 10-18 требует беспрецедентной точности при оценке роли высших порядков оптической нелинейности, обусловленных влиянием оптической решетки на сдвиг частоты "часового перехода". В настоящей статье проведен систематический расчет вкладов мультипольных нелинейных ангармонических эффектов в погрешность часов на основе оптических решеток для щелочно-земельно-подобных атомов Sr, Yb ...
Added: December 24, 2020
Remizov S., Shapiro D., Rubtsov A. N., JETP Letters 2017 Vol. 105 P. 130-136
We study quantum effects of strong driving field applied to dissipative hybrid qubit-cavity system which are relevant for a realization of quantum gates in superconducting quantum metamaterials. We demonstrate that effects of strong and non-stationary drivings have significantly quantum nature and cannot be treated by means of mean-field approximation. This is shown from a comparison ...
Added: October 29, 2021
Bell M. T., Paramanandam J., Ioffe L. et al., Physical Review Letters 2014 Vol. 112 P. 167001
Added: October 21, 2016
Mokhnenko S., Kamenski A. A., Ovsiannikov V. D., undefined 2017 Vol. 1 No. 1 P. 015006
Added: December 24, 2020
Sergeev T. T., Zyablovsky A. A., Andrianov E. S. et al., Journal of the Optical Society of America B: Optical Physics 2023 Vol. 40 No. 11 P. 2743-2750
An ultra-strong coupling regime takes place in a compound system when a coupling strength between the subsystems exceeds one tenth of the system eigenfrequency. It transforms into a deep-strong coupling regime when the coupling strength exceeds the system eigenfrequency. In these regimes, there are difficulties with description of relaxation processes without explicit considering of environment ...
Added: August 22, 2023
Cosacchi M., Seidelmann T., Wiercinski J. et al., Physical Review Research 2021 Vol. 3 No. 2 Article 023088
A Schrödinger-cat state is a coherent superposition of macroscopically distinguishable quantum states, in quantum optics usually realized as superposition of coherent states. Protocols to prepare photonic cats have been presented for atomic systems. Here we investigate in what manner and how well the preparation protocols can be transferred to a solid-state platform, namely, a semiconductor ...
Added: September 26, 2021
Shapiro D. S., Pogosov W. V., Lozovik Y., Physical Review A: Atomic, Molecular, and Optical physics 2020 Vol. 102 No. 2 Article 023703
In view of recent proposals for the realization of anisotropic light-matter interaction in such platforms as (i) nonstationary or inductively and capacitively coupled superconducting qubits, (ii) atoms in crossed fields, and (iii) semiconductor heterostructures with spin-orbital interaction, the concept of a generalized Dicke model, where coupling strengths of rotating wave and counter-rotating wave terms are ...
Added: October 31, 2021
Springer, 2019
This book brings together reviews by internationally renowed experts on quantum optics and photonics. It describes novel experiments at the limit of single photons, and presents advances in this emerging research area. It also includes reprints and historical descriptions of some of the first pioneering experiments at a single-photon level and nonlinear optics, performed before the inception ...
Added: May 14, 2019
Bolshedvorskii S., Vorobyov V., Soshenko V. et al., Optical Materials Express 2017 Vol. 7 No. 11 P. 4038-4049
In this paper, we experimentally investigate optical and spin properties of NV centers in aggregates of detonation nanodiamonds. We show that despite the small size of nanodiamonds forming the aggregate, the NV centers in these aggregates exhibit spin properties comparable to similar size nanodiamonds grown by other methods, but with brightness enhanced by a factor ...
Added: April 28, 2021
Mokhnenko S., Kamenski A. A., Ovsiannikov V. D., European Physical Journal D 2018 Vol. 72 No. 28
An asymptotic expression for the van-der-Waals constant C6(n) ≈ –0.03n12K p (x) is derived for the long-range interaction between two highly excited hydrogen atoms A and B in their extreme Stark states of equal principal quantum numbers n A = n B = n ≫ 1 and parabolic quantum numbers n1(2) = n - 1, n2(1) = m = 0 in the case of collinear orientation of the Stark-state dipolar electric moments and the interatomic ...
Added: December 24, 2020