Entangling two qubits by dissipation

Jakóbczyk, Lech

doi:10.1088/0305-4470/35/30/313

Cited by 112 publications

(56 citation statements)

References 19 publications

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“…It is known that an environment usually leads to decoherence and noise, which may cause entanglement that might have been created before to disappear. However, in certain circumstances, the environment may enhance entanglement rather than destroying it [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Entanglement generation outside a Schwarzschild black hole and the Hawking effect

2011

J. High Energ. Phys.

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We examine the Hawking effect by studying the asymptotic entanglement of two mutually independent two-level atoms placed at a fixed radial distance outside a Schwarzschild black hole in the framework of open quantum systems. We treat the two-atom system as an open quantum system in a bath of fluctuating quantized massless scalar fields in vacuum and calculate the concurrence, a measurement of entanglement, of the equilibrium state of the system at large times, for the Unruh, Hartle-Hawking and Boulware vacua respectively. We find, for all three vacuum cases, that the atoms turn out to be entangled even if they are initially in a separable state as long as the system is not placed right at the even horizon. Remarkably, only in the Unruh vacuum, will the asymptotic entanglement be affected by the backscattering of the thermal radiation off the space-time curvature. The effect of the back scatterings on the asymptotic entanglement cancels in the Hartle-Hawking vacuum case.

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Section: Introductionmentioning

confidence: 99%

Entanglement generation outside a Schwarzschild black hole and the Hawking effect

2011

J. High Energ. Phys.

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“…We note that our studies are in a sense related to the more abstract protocols presented in [1][2][3][4][5][6][7], showing that a set of entangled states of two two-level systems coupled to a common Markovian bath can be reached by purely dissipative means. However, as we aim to demonstrate schemes for concrete cavity QED experiments, we focus on maximally entangled states of three-level systems.…”

mentioning

confidence: 79%

“…A few years ago, however, it was suggested that dissipative noise can be used as a resource for quantum information processing, abetting in the preparation of entangled states. For instance, the works [1][2][3][4][5][6][7] showed that the dissipative dynamics of two atoms coupled to a common reservoir could lead to entanglement. These initial ideas were generalized in [8][9][10] to show that indeed a very general class of states and quantum information tasks could be realized by dissipation.…”

mentioning

confidence: 99%

Driving two atoms in an optical cavity into an entangled steady state using engineered decay

Reiter¹,

Kastoryano²,

Sørensen³

2012

New J. Phys.

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We propose various schemes for the dissipative preparation of a maximally entangled steady state of two atoms in an optical cavity. Harnessing the natural decay processes of cavity photon loss and spontaneous emission, we use an effective operator formalism to identify and engineer effective decay processes, which reach an entangled steady state of two atoms as the unique fixed point of the dissipative time evolution. We investigate various aspects that are crucial for the experimental implementation of our schemes in presentday and future cavity quantum electrodynamics systems and analytically derive the optimal parameters, the error scaling and the speed of convergence of our protocols. Our study shows promising performance of our schemes for existing cavity experiments and favorable scaling of fidelity and speed with respect to the cavity parameters.

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“…On the one hand, the vacuum fluctuations can lead to decay that can adversely affect the quantum coherence and reduce entanglement [2,3]. On the other hand, the decay due to the vacuum fluctuation can generate entanglement from initially unentangled qubits [4][5][6][7][8][9][10], thus leading to induced entanglement. This latter effect has been studied for identical qubits coupled to either a common multimode vacuum field [4][5][6][7][8] or to a damped single-mode cavity field [9,10].…”

mentioning

confidence: 99%

“…Such a process has been called the delayed sudden birth of entanglement [8] as opposed to the sudden death of entanglement from an initially entangled state. Most previous studies about the sudden birth of entanglement [4][5][6][7][8] require two close-lying atoms with a distance less than one wave length at the transition frequency. Recently, it has been proposed to realize such entanglement generation between two distant qubits (about ten wavelengths apart) by using left-handed materials [11] via enhancement of the interaction between distant qubits.…”

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confidence: 99%

Entanglement generation between two atoms via surface modes

Al‐Amri

Yang

et al. 2011

Phys. Rev. A

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We discuss the coupling of two identical atoms, separated by a metal or metamaterial slab, through surface modes. We show that the coupling through the surface modes can induce entanglement. We discuss how to control the coupling for the metal or metamaterial slab by adjusting the symmetrical and antisymmetrical property of the surface modes. We analyze the dispersion relation of the surface modes and study the parameter ranges that support the surface modes with the same properties. Our results have potential applications in quantum communication and quantum computation.

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Entangling two qubits by dissipation

Cited by 112 publications

References 19 publications

Entanglement generation outside a Schwarzschild black hole and the Hawking effect

Entanglement generation outside a Schwarzschild black hole and the Hawking effect

Driving two atoms in an optical cavity into an entangled steady state using engineered decay

Entanglement generation between two atoms via surface modes

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