Steady state entanglement of distant nitrogen-vacancy centers in a coherent thermal magnon bath

Ullah, Kamran; Köse, Emre; Yagan, Rawana; Onbaşlı, Mehmet C.; Müstecaplıoğlu, Özgür E.

doi:10.1103/physrevresearch.4.023221

Cited by 5 publications

(1 citation statement)

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“…Besides that, it has been recently shown a close relation between quantifiers of coherence and entanglement [43]. In recent years, employing quantum coherence as a resource, several interesting results have been obtained in different quantum systems, among them, in quantum thermodynamics [44,45], quantum dots [46,47], Heisenberg spin chains [48][49][50], spin waves [51], quantum batteries [52], quantum computation [53,54], among others.…”

Section: Introductionmentioning

confidence: 98%

Thermal Quantum Correlations in Two Gravitational Cat States

Rojas

Lobo

2023

Universe

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We consider the effect of a thermal bath on quantum correlations induced by the gravitational interaction in the weak field limit between two massive cat states, called gravitational cat (gravcat) states. The main goal of this paper is to provide a good understanding of the effects of temperature and several parameters in the entanglement (measured by the concurrence) and quantum coherence (measured by the l1-norm that is defined from the minimal distance between the quantum state and the set of incoherent states) which are derived from the thermal quantum density operator. Our results show that the thermal concurrence and l1-norm can be significantly optimized by increasing the masses or decreasing the distance between them. We investigate and discuss the behavior of these quantities under temperature variations in different regimes, including some that are expected to be experimentally feasible in the future. In particular, we observe that thermal fluctuations raise non-entangled quantum correlations when entanglement suddenly drops.

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Section: Introductionmentioning

confidence: 98%

Thermal Quantum Correlations in Two Gravitational Cat States

Rojas

Lobo

2023

Universe

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Mixing thermal coherent states for precision and range enhancement in quantum thermometry

Ullah,

Tahir Naseem,

Müstecaplıoğlu

2024

Quantum Sci. Technol.

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The unavoidable interaction between thermal environments and quantum systems typically leads to the degradation of quantum coherence, which can be fought against by reservoir engineering. We propose the realization of a special mixture of thermal coherent states by coupling a thermal bath with a two-level system that is longitudinally coupled to a resonator. We find that the state of the resonator is a special mixture of two oppositely displaced thermal coherent states, whereas the two-level system remains thermal. This observation is verified by evaluating the second-order correlation coefficient for the resonator state. Moreover, we reveal the potential benefits of employing the mixture of thermal coherent states of the resonator in quantum thermometry. In this context, the resonator functions as a probe to measure the unknown temperature of a bath mediated by a two-level system, strategically bridging the connection between the two. Our results show that the use of an ancillary-assisted probe may enhance the precision and broaden the applicable temperature range.

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