Finite-time response function of uniformly accelerated entangled atoms

We investigate the radiative processes of accelerated entangled two-level systems. Using first-order perturbation theory, we evaluate transition rates of two entangled Unruh-DeWitt detectors rotating with the same angular velocity interacting with a massive scalar field. Decay processes for arbitrary radius, angular velocities, and energy gaps are analyzed. We discuss the mean-life of entangled states and entanglement harvesting and degradation.

Section: Radiative Processes Of Non-inertial Entangled Detectorsmentioning

confidence: 62%

Section: Jhep08(2020)025mentioning

confidence: 98%

Radiative processes of entangled detectors in rotating frames

Picanço

Svaiter

Zarro

2020

“…We begin our analysis elucidating on the radiative process of two entangled Unruh-DeWitt detectors. This model has been taken up earlier in several situations [20,24,25]. Since we need this, a brief review of it will be presented here in order to make the discussion self-sufficient.…”

Section: Radiative Process Of Two Entangled Atoms: a Model Set-upmentioning

confidence: 99%

“…Then it becomes imperative to understand the reasons of these degradation, so that sincere predictions can be provided. All these reasonings motivated the developments on studying the transition rates between different states of entangled atoms in different trajectories, which are thriving with many new ideas and possibilities, see [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. In this purpose the concept of two-level atomic Unruh-deWitt detectors are essential.…”

Section: Introductionmentioning

confidence: 99%

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Radiative process of two entangled uniformly accelerated atoms in a thermal bath: a possible case of anti-Unruh event

Barman

Majhi

2021

We study the radiative process of two entangled two-level atoms uniformly accelerated in a thermal bath, coupled to a massless scalar field. First, by using the positive frequency Wightman function from the Minkowski modes with a Rindler transformation we provide the transition probabilities for the transitions from maximally entangled symmetric and anti-symmetric Bell states to the collective excited or ground state in (1 + 1) and (1 + 3) dimensions. We observe a possible case of anti-Unruh-like event in these transition probabilities, though the (1+1) and (1+3) dimensional results are not completely equivalent. We infer that thermal bath plays a major role in the occurrence of the anti-Unruh-like effect, as it is also present in the transition probabilities corresponding to a single detector in this case. Second, we have considered the Green’s functions in terms of the Rindler modes with the vacuum of Unruh modes for estimating the same. Here the anti-Unruh effect appears only for the transition from the anti-symmetric state to the collective excited or ground state. It is noticed that here the (1 + 1) and (1 + 3) dimensional results are equivalent, and for a single detector, we do not observe any anti-Unruh effect. This suggests that the entanglement between the states of the atoms is the main cause for the observed anti-Unruh effect in this case. In going through the investigation, we find that the transition probability for a single detector case is symmetric under the interchange between the thermal bath’s temperature and the Unruh temperature for Rindler mode analysis; whereas this is not the case for Minkowski mode. We further comment on whether this observation may shed light on the analogy between an accelerated observer and a real thermal bath. An elaborate investigation for the classifications of our observed anti-Unruh effects, i.e., either weak or strong anti-Unruh effect, is also thoroughly demonstrated.

Constructing an entangled Unruh Otto engine and its efficiency

Barman

Majhi

2022

Uniformly accelerated frame mimics a thermal bath whose temperature is proportional to the proper acceleration. Using this phenomenon we give a detailed construction of an Otto cycle between two energy eigenstates of a system, consists of two entangled qubits. In the isochoric stages the thermal bath is being provided via the vacuum fluctuations of the background field for a monopole interaction by accelerating them. We find that making of Otto cycle is possible when one qubit is accelerating in the right Rindler wedge and other one is moving in the left Rindler wedge; i.e. in anti-parallel motion, with the initial composite state is a non-maximally entangled one. However, the efficiency greater than that of the usual single qubit quantum Otto engine is not possible. We provide values of the available parameters which make Otto cycle possible. On the other hand, Otto cycle is not possible if one considers the non-maximally entangled state for parallel motion. Moreover, for both initial symmetric and anti-symmetric Bell states we do not find any possibility of the cycle for qubits’ parallel and anti-parallel motion.