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Robust multipartite entanglement generation via cascaded interactions

Barış Çakmak, Steve Campbell, Bassano Vacchini, Özgür Esat Müstecaplıoğlu, Mauro Paternostro

Published Mar 14, 2018• 1 citation
OpenAlex

Abstract

We examine a simple scheme to generate genuine multipartite entangled states across disjoint qubit registers. We employ a shuttle qubit that is sequentially coupled, in an energy preserving manner, to the constituents within each register through a cascade of interactions. We establish that stable $W$-type entanglement can be generated among all qubits within the registers. Furthermore, we find that the entanglement is sensitive to how the shuttle is discarded, showing that a significantly larger degree is achieved by performing projective measurements on it. Finally, we assess the resilience of this entanglement generation protocol to several types of noise and imperfections, showing that it is remarkably robust.

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We examine a simple scheme to generate genuine multipartite entangled states across disjoint qubit registers. We employ a shuttle qubit that is sequentially coupled, in an energy preserving manner, to the constituents within each register through a cascade of interactions. We establish that stable WWW-type entanglement can be generated among all qubits within the registers. Furthermore, we find that the entanglement is sensitive to how the shuttle is discarded, showing that a significantly larger degree is achieved by performing projective measurements on it. Finally, we assess the resilience of this entanglement generation protocol to several types of noise and imperfections, showing that it is remarkably robust.
We examine a simple scheme to generate genuine multipartite entangled states across disjoint qubit registers. We employ a shuttle qubit that is sequentially coupled, in an energy preserving manner, to the constituents within each register through rounds of interactions. We establish that stable WWW-type entanglement can be generated among all qubits within the registers. Furthermore, we find that the entanglement is sensitive to how the shuttle is treated, showing that a significantly larger degree is achieved by performing projective measurements on it. Finally, we assess the resilience of this entanglement generation protocol to several types of noise and imperfections, showing that it is remarkably robust.
We have studied the generation of multipartite entangled states for the superconducting phase qubits. The experiments performed in this direction have the capacity to generate several specific multipartite entangled states for three and four qubits. Our studies are also important as we have used a computable measure of genuine multipartite entanglement whereas all previous studies analyzed certain probability amplitudes. As a comparison, we have reviewed the generation of multipartite entangled states via von Neumann projective measurements.
We have studied the generation of multipartite entangled states for the superconducting phase qubits. The experiments performed in this direction have the capacity to generate several specific multipartite entangled states for three and four qubits. Our studies are also important as we have used a computable measure of genuine multipartite entanglement whereas all previous studies analyzed certain probability amplitudes. As a comparison, we have reviewed the generation of multipartite entangled states via von Neumann projective measurements.
Nonlocal multipartite entanglement holds significant potential for both fundamental physics and practical applications. We present a robust protocol for generating remote entanglement, specifically W states, among multiple nonlocal superconducting qubits. Our protocol employs practical microwave pulse scattering through a microwave cavity, which is coupled to a far-detuned superconducting transmon qubit, facilitating a CNOT-like operation. Our approach can be implemented without the need for single microwave-photon sources and its completion is heralded by microwave photon measurements. Furthermore, our protocol can generate faithful nonlocal W states of distant superconducting qubits with practical detector units, each cascading two quantum non-demolition detectors, rather than ideal single-photon detectors. These distinct features make our protocol particularly useful for large quantum secure communication networks.
Entanglement generation and distribution is a core functionality of quantum networks. Traditional approaches to this functionality rely on chains of quantum repeaters or on manipulation of multipartite states. In this work, we explore an alternative paradigm that explores quantum coherence at propagation level, by enabling genuine quantum instantiations of communication channels, existing in superposed configurations. We demonstrate that this mechanism can be harnessed to generate both bipartite and multipartite entangled states from separable inputs. Specifically, we show that Bell states can be obtained from initially separable two-qubit states, through the superposition of two unitary quantum channels. The proposed approach is further extended to multipartite systems, by generating n-qubit GHZ and W states and thereby revealing the constructive role of superposed quantum operations in entanglement creation. Moreover, we analyze the robustness of the proposed scheme against noise, showing that the resulting states retain high fidelity and concurrence even under realistic imperfections. Our results suggest that, under appropriate quantum control, noisy superposed paths can be effectively harnessed to engineer entanglement generation and distribution in quantum networks.
Entanglement generation and distribution is a core functionality of quantum networks. Traditional approaches to this functionality rely on chains of quantum repeaters or on manipulation of multipartite states. In this work, we explore an alternative paradigm that explores quantum coherence at propagation level, by enabling genuine quantum instantiations of communication channels, existing in superposed configurations. We demonstrate that this mechanism can be harnessed to generate both bipartite and multipartite entangled states from separable inputs. Specifically, we show that Bell states can be obtained from initially separable two-qubit states, through the superposition of two unitary quantum channels. The proposed approach is further extended to multipartite systems, by generating n-qubit GHZ and W states and thereby revealing the constructive role of superposed quantum operations in entanglement creation. Moreover, we analyze the robustness of the proposed scheme against noise, showing that the resulting states retain high fidelity and concurrence even under realistic imperfections. Our results suggest that, under appropriate quantum control, noisy superposed paths can be effectively harnessed to engineer entanglement generation and distribution in quantum networks.