Generating quantum entanglement between macroscopic objects with continuous measurement and feedback control

We theoretically investigate the effect of phase fluctuations on correlated photons resulting from nondegenerate three-level atoms under the cavity radiation. The photon statistics, photon number correlation, and entanglement properties of the system have been calculated employing the dynamical equation of the system. It is shown that, for the sub-Poissonian photon statistics, the degree of correlation increases with the atomic pumping rate, and the entanglement varies with phase fluctuations, rather than with the atomic pumping rate. The proposed system is well suitable for the quantum information processing.

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“…The entanglement is achieved, when 𝐸 𝑁 is positive within the region of the lowest eigenvalue of the covariance matrix 𝑉 𝑆 < 1 [37].…”

Section: Entanglement Quantificationmentioning

confidence: 99%

The Quantum Features of Correlated Photons with the Effect of Phase Fluctuation

Kumela¹,

Gemta²,

Hordofa³

et al. 2023

Ukr. J. Phys.

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“…In addition, hybrid magnonics enables an excellent protocol for the generation and manipulation of macroscopic quantum states. For instance, the macroscopic entangled states are powerful resources for doing tasks in quantum computation [21,22], and quantum cryptography [23], as well as performing quantum nonlocality test [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Magnon-magnon entanglement generation between two remote interaction-free optomagnonic systems via optical Bell-state measurement

Golkar,

Ghasemian,

Setodeh Kheirabady

et al. 2023

Phys. Scr.

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Finding new strategies for the generation and preservation of quantum resources, e.g., entanglement between spatially separated macroscopic systems enables reliable and fertile platforms to study both fundamental quantum physics and fruitful applications such as quantum networks and distant quantum information processing. Here, we want to address how to generate magnon-magnon entanglement (MME) in an optomagnonic system based on the optical Bell-state measurement. To do so, we consider ahybrid optomagnonic system comprising of two identical, but distant dissipative microwave cavities, each containing a ferromagnetic YIG sphere and a superconducting qubit. Besides, each subsystem is driven via an external laser field. We numerically simulate thesolution of the corresponding master equation and discuss the time-dependent as well as the steady state entanglement between the distant magnon modes at different interaction regime. Also, the fidelity of the generated entangled states is studied in detail. Generally,the dissipative environmental effects plague the MME, however, it is possible to generate a considerable amount of MME even at the steady state regime. Also, the results show that the robust MME may be enhanced by applying a relatively strong external pump decreasing the relative magnon damping rate as well as increasing the relative qubit-photon coupling strength, while some other parameters involved in the model, i.e., the atomic damping rate and detuning parameter do not considerably affect the amplitude (the maximum value) of MME. Exceptionally, although the magnon damping rate decreases the amount of MME, the entanglement stability takes place in a longer time interval in the strong magnonic damping regime. Moreover, the maximum of the steady state entanglement may be obtained in the moderate magnon-photon coupling regime provided that the system is driven by strong external pumps. Furthermore, the system can generate robust MME at steady state, especially in the small detuning regime. Our further investigationsshow that the system can provide relatively high-fidelity magnonic entangled states even in the presence of inevitable environmental effects. The proposed model offers an attractive platform for the generation of quantum resources to establish long-distance quantumnetworks based on magnonic and photonic systems.

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Emerging quantum ridges and dynamic patterns in diverse field landscapes

Rahman,

Qiao

2024

Quantum Inf Process

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Generating quantum entanglement between macroscopic objects with continuous measurement and feedback control

Cited by 15 publications

References 43 publications

The Quantum Features of Correlated Photons with the Effect of Phase Fluctuation

The Quantum Features of Correlated Photons with the Effect of Phase Fluctuation

Magnon-magnon entanglement generation between two remote interaction-free optomagnonic systems via optical Bell-state measurement

Emerging quantum ridges and dynamic patterns in diverse field landscapes

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