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Europhysics Letters (EPL)

Quantum state transfer between nitrogen vacancy center ensembles in hybrid quantum system

Hamad Ali, Abdul Basit, Fazal Badshah, Misbah Qurban, Guo-Qin Ge

Published Sep 23, 2019• 3 citations
Publisher

Abstract

We propose a system for quantum state transfer (QST) between two nitrogen-vacancy center ensembles (NVEs) coupled to two transmission line resonators (TLRs) via flux qubits (FQs). We study the transfer of an arbitrary quantum state by various system's controlling parameters i.e. , the coupling between nitrogen vacancy ensembles g , the coupling strength between resonators λ for both the resonant and non-resonant interactions in the presence of decoherence. Furthermore, we investigate the dynamics of QST for three different cases, i.e. , g ≫ λ , g ≃ λ and g ≪ λ in detail. It is found that the quantum state can be efficiently transferred between NVEs for suitable values of controlling parameters. We observe that the fidelity of quantum state transfer is about 99 % in all cases for short operational time ( 0.45 μ s ) while in the presence of decoherence fidelity is above 96 % . This reveals that decoherence has no prominent effect on quantum state transfer.

DOI
10.1209/0295-5075/127/30007

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We propose a system for quantum state transfer (QST) between two nitrogen-vacancy center ensembles (NVEs) coupled to two transmission line resonators (TLRs) via flux qubits (FQs). We study the transfer of an arbitrary quantum state by various system's controlling parameters i.e. , the coupling between nitrogen vacancy ensembles g , the coupling strength between resonators λ for both the resonant and non-resonant interactions in the presence of decoherence. Furthermore, we investigate the dynamics of QST for three different cases, i.e. , g ≫ λ , g ≃ λ and g ≪ λ in detail. It is found that the quantum state can be efficiently transferred between NVEs for suitable values of controlling parameters. We observe that the fidelity of quantum state transfer is about 99 % in all cases for short operational time ( 0.45 μ s ) while in the presence of decoherence fidelity is above 96 % . This reveals that decoherence has no prominent effect on quantum state transfer.
We investigate the dissipative dynamics of a hybrid system consisting of two inductively coupled superconducting flux qubits (FQs), each of which couples magnetically with a nitrogen-vacancy-center spin ensemble (NVE). The system displays a series of damped oscillations under various experimental situations, where we obtain analytically the time-dependent populations associated with arbitrary values of the FQ-FQ inductively coupling strength ggg and the FQ-NVE magnetically coupling strength GGG in the one-excitation case. Our results show that a reliable high-fidelity quantum state transfer between the two distant NVEs can be realized by modulating the parameters ggg and G.G.G. Furthermore, we also present a potentially practical idea to entangle the two separate NVEs, which is within reach due to the currently available technology.
With the local resonant interaction between a nitrogen-vacancy-center ensemble (NVE) and a superconducting coplanar resonator, and the single-qubit operation, we propose two protocols for the state transfer between two remote NVEs and for a fast controlled-phase (cphase) gate on these NVEs, respectively. This hybrid quantum system is composed of two distant NVEs coupled to separated high-QQQ transmission line resonators (TLRs), which are interconnected by a current-biased Josephson-junction superconducting phase qubit. The fidelity of our state-transfer protocol is about 99.6399.63%99.63 within the operation time of 70.6070.6070.60 ns. The fidelity of our cphase gate is about 98.1598.15%98.15 within the operation time of 93.8793.8793.87 ns. Furthermore, using the cphase gate, we construct a two-dimensional cluster state on NVEs in a $n\ifmmode\times\else\texttimes\fi{}n$ square grid based on the hybrid quantum system for the one-way quantum computation. Our protocol may be more robust, compared with the one based on the superconducting resonators, due to the long coherence time of NVEs at room temperature.
Abstract We theoretically investigate an efficient scheme for quantum state transfer (QST) between two nitrogen-vacancy (N-V) centers coupled to the whispering gallery modes (WGM) of a micro-resonator. We analyze the impact of mode coupling and the distance between two N-V centers on the dynamics of state transfer. Specifically, we explore QST under three coupling regimes:comparable coupling (J ≃ g), strong mode coupling J ≫ g, and weak mode coupling J ≪ g, also incorporating system decay factors (WGM decay Γ and N-V dephasing γ) at different interparticle distances. Our study shows that by adjusting the system control parameters, quantum information can be transferred between N-V centers with high efficiency. Additionally, the fidelity of QST reaches approximately 99% in all cases, with an oscillatory pattern, reflecting the intricate interplay between NV-resonator and mode coupling strengths. These findings underscore the importance of interparticle distance and mode coupling in the realization of solid-state qubit-based quantum information processing devices.
Abstract The control of hybrid quantum systems via the application of external fields is rapidly evolving field of research for the development of quantum applications and technologies. We model and optimize the dynamics of a hybrid quantum system consists of two non-local ensembles of nitrogen-vacancy centers and a superconducting transmon qubit mediated by two transmission line resonators. We apply a set of optimized time-dependent external driving field to enhance the system performance to function as a high fidelity state-to-state transfer. The Hamiltonian of the externally driven transmission line resonators is modelled by considering the non-linear transmons. The numerical simulation of the system is done using the optimized parameters of the external fields. By applying the optimized pulses, we have increased the fidelity of the state transfer from 0.7 to 1.0 within 100 ns. By varying the full wave half maxima value (FWHM) of the Gaussian pulse, it result in decreasing the amplitude of the fast oscillating states of the transmon and nitrogen-vacancy ensembles. These optimized external pulses also created a strong coupling between the components of under-consideration physical quantum system, which will eventually increase the fidelity of the system in a relatively faster time.
We study a hybrid quantum computing system using a nitrogen-vacancy center ensemble (NVE) as quantum memory, a current-biased Josephson junction (CBJJ) superconducting qubit fabricated in a transmission line resonator (TLR) as the quantum computing processor, and the microwave photons in TLR as the quantum data bus. The storage process is seriously treated by considering all kinds of decoherence mechanisms. Such a hybrid quantum device can also be used to create multiqubit WWW states of NVEs through a common CBJJ. The experimental feasibility is achieved using currently available technology.
Abstract We investigate hybrid flux-nitrogen-vacancy (NV) entanglement in the system consisting of two flux qubits and an NV-center ensemble (NVE). The influence of the initial entanglement degree of the flux qubit C, the coupling strength between two flux qubits, the coupling strength between the flux qubit M and the NVE on the bipartite entanglement and the tripartite entanglement is discussed. The maximally bipartite entangled state and the maximally tripartite entangled state can be obtained under certain conditions. In addition, it is shown that the time of disentanglement of the hybrid quantum system can be controlled by adjusting the coupling strength between two flux qubits and the coupling strength between the flux qubit M and the NVE.