Engineering steady states using jump-based feedback for multipartite entanglement generation

Stevenson, Robin; Hope, Joseph; Carvalho, André

doi:10.1103/physreva.84.022332

Cited by 37 publications

(36 citation statements)

References 43 publications

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“…A huge effort has been dedicated to the comprehension of the detrimental environmental effects [7][8][9][10][11][12] and in conceiving suitable approaches to contrast the natural decay of quantum correlations [13]. They include reservoir engineering [13], feedback methods [14], distillation protocols [15], decoherence free-subspaces [16], non-Markovian effects [8], weak measurements [17], quantum Zeno effect [18], dynamical decoupling [19] and reservoir monitoring [20]. Different protocols exploiting dissipative effects to realize steady entanglement have been proposed [21][22][23].…”

mentioning

confidence: 99%

Steady entanglement out of thermal equilibrium

Bellomo¹,

Antezza²

2013

EPL

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PACS 03.65.Yz -Decoherence; open systems; quantum statistical methods PACS 03.67.Bg -Entanglement production and manipulation PACS 03.67.Pp -Quantum error correction and other methods for protection against decoherence Abstract -We study two two-level atomic quantum systems (qubits) placed close to a body held at a temperature different from that of the surrounding walls. While at thermal equilibrium the two-qubit dynamics is characterized by not entangled steady thermal states, we show that absence of thermal equilibrium may bring to the generation of entangled steady states. Remarkably, this entanglement emerges from the two-qubit dissipative dynamic itself, without any further external action on the two qubits, suggesting a new protocol to produce and protect entanglement which is intrinsically robust to environmental effects.Introduction. -Entanglement represents one of the key features in quantum mechanics [1] due to its connection to non locality [2,3] and its crucial role in quantum information [4]. Environmental noise [5] induces decoherence [6] and is typically responsible for the fragility of entanglement [7]. This represents one of the major obstacles to the concrete realization of quantum technologies related to quantum information processing [1,4]. A huge effort has been dedicated to the comprehension of the detrimental environmental effects [7][8][9][10][11][12] Here, we introduce a direct procedure to protect entanglement realized by bringing the environment of a twoqubit system out of thermal equilibrium. Physical systems consisting of two qubits in a common environment in absence [24][25][26] or presence [27,28] of matter have been largely investigated at thermal equilibrium, pointing out the creation of entanglement due to the field mediated interaction, which however typically washes off asymptot-

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confidence: 99%

Steady entanglement out of thermal equilibrium

Bellomo¹,

Antezza²

2013

EPL

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“…However, reservoir engineering methods have changed the idea of trying to minimize coupling to the environment to one of modifying the properties of the environment in order to achieve a desired state. These methods include using dissipative dynamics [4][5][6][7][8][9], recently extended to systems out of thermal equilibrium [10][11][12][13][14], as well as, e.g., exploiting the effect of measurements and feedback to achieve a desired final state [15,16].…”

Section: Introductionmentioning

confidence: 99%

Robust entanglement with three-dimensional nonreciprocal photonic topological insulators

2017

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We investigate spontaneous and pumped entanglement of two level systems in the vicinity of a photonic topological insulator interface, which supports a nonreciprocal (unidirectional), scatteringimmune and topologically-protected surface plasmon polariton in the bandgap of the bulk material. To this end, we derive a master equation for qubit interactions in a general three-dimensional, nonreciprocal, inhomogeneous and lossy environment. The environment is represented exactly, via the photonic Green function. The resulting entanglement is shown to be extremely robust to defects occurring in the material system, such that strong entanglement is maintained even if the interface exhibits electrically-large and geometrically sharp discontinuities. Alternatively, depending on the initial excitation state, using a non-reciprocal environment allows two qubits to remain unentangled even for very close spacing. The topological nature of the material is manifest in the insensitivity of the entanglement to variations in the material parameters that preserve the gap Chern number. Our formulation and results should be useful for both fundamental investigations of quantum dynamics in nonreciprocal environments, and technological applications related to entanglement in two-level systems.

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“…In future, it's an interesting topic to explore the effects of a homodyne measurement scheme and the detection efficiency on the quantum Fisher information. In addition, the quantum Fisher information of multi-qubits [42] are another valuable subject.…”

Section: Discussionmentioning

confidence: 99%

Enhancing parameter precision of optimal quantum estimation by direct quantum feedback

Zheng

Yao

et al. 2015

Phys. Rev. A

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Various schemes have been proposed to overcome the drawback of the decoherence on quantum-enhanced parameter estimation. Here we suggest an alternative method, quantum feedback, to enhance the parameter precision of optimal quantum estimation of a dissipative qubit by investigating its dynamics of quantum Fisher information. We find that compared with the case without feedback, the quantum Fisher information of the dissipative qubit in the case of feedback has a large maximum value in time evolution and a smaller decay rate in the long time.

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Engineering steady states using jump-based feedback for multipartite entanglement generation

Cited by 37 publications

References 43 publications

Steady entanglement out of thermal equilibrium

Steady entanglement out of thermal equilibrium

Robust entanglement with three-dimensional nonreciprocal photonic topological insulators

Enhancing parameter precision of optimal quantum estimation by direct quantum feedback

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