Decoherence-Induced Sudden Death of Entanglement and Bell Nonlocality

Im, Dong-Gil; Kim, Yoon-Ho

doi:10.3390/photonics9020058

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…We investigate the entanglement (quantified by concurrence) of the state (10) undergoing various noisy dynamics, namely, amplitude damping, phase damping, and depolarizing, as shown in Figure 4 [ 34 ]. It can be seen that entanglement vanishes for depolarizing noise strength

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Section: Resultsmentioning

confidence: 99%

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Robust Quantum State Tomography Method for Quantum Sensing

Farooq

Khalid

Rehman

et al. 2022

Sensors

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Reliable and efficient reconstruction of pure quantum states under the processing of noisy measurement data is a vital tool in fundamental and applied quantum information sciences owing to communication, sensing, and computing. Specifically, the purity of such reconstructed quantum systems is crucial in surpassing the classical shot-noise limit and achieving the Heisenberg limit, regarding the achievable precision in quantum sensing. However, the noisy reconstruction of such resourceful sensing probes limits the quantum advantage in precise quantum sensing. For this, we formulate a pure quantum state reconstruction method through eigenvalue decomposition. We show that the proposed method is robust against the depolarizing noise; it remains unaffected under high strength white noise and achieves quantum state reconstruction accuracy similar to the noiseless case.

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.…”

Section: Resultsmentioning

confidence: 99%

“… Entanglement (quantified by concurrence [ 34 ]) of the state ( 10 ) as a function of noise strength parameter

. …”

Section: Figurementioning

confidence: 99%

Robust Quantum State Tomography Method for Quantum Sensing

Farooq

Khalid

Rehman

et al. 2022

Sensors

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show abstract

“…Classical game theory [26,27], and arguably quantum game theory [1], might offer great potential to advance our understanding of the quantum origins of biology [28,29] and even consciousness [30]. Because decoherence induces the transition of quantum states into classical states [31,32], analyzing not only physical models for realization of quantum games but also the impact of the imperfections of initial states, operations and measurements on the players' payoffs appears to be of great importance in studying quantum games, which could shed light on the quantum origins of biological evolution.…”

Section: Introductionmentioning

confidence: 99%

Prisoners’ Dilemma in a Spatially Separated System Based on Spin–Photon Interactions

et al. 2022

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Having access to ideal quantum mechanical resources, the prisoners’ dilemma can be ceased Here, we propose a distributed quantum circuit to allow spatially separated prisoners to play the prisoners’ dilemma game. Decomposing the circuit into controlled-Z and single-qubit gates only, we design a corresponding spin–photon-interaction-based physical setup within the reach of current technology. In our setup, spins are considered to be the players’ logical qubits, which can be realized via nitrogen-vacancy centers in diamond or quantum dots coupled to optical cavities, and the game is played via a flying photon realizing logic operations by interacting with the spatially separated optical cavities to which the spin qubits are coupled. We also analyze the effect of the imperfect realization of two-qubit gates on the game, and discuss the revival of the dilemma and the emergence of new Nash equilibria.

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Dynamics of a multipartite hybrid quantum system with beamsplitter, dipole–dipole, and Ising interactions

Laha

2023

J. Opt. Soc. Am. B

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The possibility of exploiting heterogeneous quantum systems to high precision, for storing, processing, and transmitting information, makes them ideal candidates for multitasking purposes in quantum communication. Appropriate quantum systems involving a judicious choice of interactions that augment each other are potentially useful for probing deep into quantum regimes. Here, we use one such hybrid bipartite quantum model, with one subsystem made of a pair of qubits and another comprising a pair of oscillators, to study the entanglement dynamics and the entanglement transfer between discrete and continuous variables. The basic model is the standard double Jaynes–Cummings model, which, under suitable conditions, is known to support both entanglement transfer and entanglement sudden death. In this work, we generalize this model to include further experimentally relevant interactions, such as the beamsplitter-type exchange interaction between the oscillators, and dipole–dipole and Ising-type interactions between the qubits. The way various interactions and initial oscillator states affect the entanglement dynamics is examined theoretically for generic experimental conditions. Using exact analytical solutions, we show that, compared to the beamsplitter or dipole–dipole interaction, the Ising interaction can have a significant positive impact on entanglement sudden death and birth, and the postponement of the onset of these phenomena, apart from producing a substantial reduction in the time duration of the death.

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Decoherence-Induced Sudden Death of Entanglement and Bell Nonlocality

Cited by 3 publications

References 31 publications

Robust Quantum State Tomography Method for Quantum Sensing

Robust Quantum State Tomography Method for Quantum Sensing

Prisoners’ Dilemma in a Spatially Separated System Based on Spin–Photon Interactions

Dynamics of a multipartite hybrid quantum system with beamsplitter, dipole–dipole, and Ising interactions

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