Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Chinese Journal of Physics

High-fidelity quantum state transfer and strong coupling in a hybrid NV center coupled to CPW cavity system

Qinghong Liao, Yanchao Fu, Jiangong Hu

Published May 20, 2020• 3 citations
Publisher
DOI
10.1016/j.cjph.2020.02.035

Related papers

High fidelity and flexible quantum state transfer in the atom-coupled cavity hybrid system

B. F. C. Yabu-uti, José Antonio Roversi

Quantum Information Processing•Feb 4, 2012•11 citations

Quantum State Transfer Between NV Center -- $13_C$ System Coupled To A CPW Cavity

Pal, Soubhik, Chiranjib Mitra

Quantum state transfer is a very important process in building a quantum network when information from flying Qubit is transferred to the stationary Qubit in a node via a quantum state transfer. NV centers due to their long coherence time and the presence of nearby $13_C$ nuclear spin is an excellent candidate for multi-Qubit quantum memory. Here we propose a theoretical description for such a quantum state transfer from a cavity to a nearest neighbour $13_C$ nuclear spin of a single Nitrogen vacancy center in diamond; it shows great potential in realizing scalable quantum networks and quantum simulation. The full Hamiltonian was considered with the zeroth-order and interaction terms in the Hamiltonian and the theory of effective hamiltonian theory was applied. We study the time evolution of the combined cavity-$13_C$ state through analytical calculation and simulation using QuTip. Graphs for state transfer and fidelity measurement are presented here. We show that our theoretical description verifies a high fidelity quantum state transfer from the cavity to $13_C$ center by choosing suitable system parameters.

arXiv:2105.11507•May 24, 2021•0 citations

Quantum coherence of a single NV center in a spin-cavity hybrid system

Jian Zhang, Shengran Lin, Junfeng Wang +3 more

The European Physical Journal B•Mar 1, 2022•2 citations

Coupling a single nitrogen-vacancy center with a superconducting qubit via the electro-optic effect

Changhao Li, Fuli Li

We propose an efficient scheme for transferring quantum states and generating entangled states between two qubits of different nature. The hybrid system consists of a single nitrogen-vacancy (NV) center and a superconducting (SC) qubit, which couple to an optical cavity and a microwave resonator, respectively. Meanwhile, the optical cavity and the microwave resonator are coupled via the electro-optic effect. By adjusting the relative parameters, we can achieve high-fidelity quantum state transfer as well as highly entangled states between the NV center and the SC qubit. This protocol is within the reach of currently available techniques, and may provide interesting applications in quantum communication and computation with single NV centers and SC qubits.

arXiv:1804.10722•Physical Review A•May 15, 2018•14 citations

High‐Fidelity Hybrid Quantum Gates between a Flying Photon and Diamond Nitrogen‐Vacancy Centers Assisted by Low‐Q Single‐Sided Cavities

Ming Li, Jia‐Ying Lin, Mei Zhang

Abstract High‐fidelity universal quantum gates are crucial in quantum computing. Three high‐fidelity universal quantum gates, namely the hybrid controlled NOT gate, the hybrid Toffoli gate, and the hybrid Fredkin gate, on a flying photon qubit and diamond nitrogen‐vacancy (NV) centers, assisted by low‐Q single‐sided cavities, are presented. Errors due to the imperfection of the practical input–output process are detected to improve the fidelity of these quantum gates, which therefore relaxes the requirement on their implementation, since strong coupling is no longer mandatory. In addition, quantum gates have the advantage that they can work faithfully even when the resonant condition among the NV center, the photon, and the cavity is not strictly satisfied, or the NV centers are not identical. The performance and success probability of these quantum gates are analyzed, finding that these schemes are feasible with current technology.

Annalen der Physik•Nov 4, 2018•10 citations

Chiral magnons for spin-qubit state transfer

Martijn Dols, Carlos Gonzalez-Ballestero, Mikhail Cherkasskii +3 more

We propose a protocol where chiral magnons mediate a state transfer between two distant spin qubits. The protocol is implemented by varying the coupling between the spin qubits and the magnons in time, such that an arbitrary state is transferred from one qubit to the other. The modulation of the coupling is performed such that the two-spin-qubit state is kept as a dark state of the magnon bath, bypassing the associated losses. We show that the protocol can be realized on a hybrid system composed of two nitrogen-vacancy (NV) centers coupled to the nonreciprocal and chiral magnon modes of an yttrium iron garnet (YIG) stripe. We propose two methods to achieve the time modulation of the NV-magnon coupling: i) the NV-magnet distance of both NV centers is varied; ii) the external magnetic field and the NV-magnet distance of one NV center are varied. We evaluate the implementability of both methods numerically, including the constraints on the temperature, and the dephasing time and minimal lifetime of the spin qubits required for high-fidelity state transfer. We find that using realistic experimental parameters, a state transfer between NV centers at a distance of several microns can be achieved with a fidelity $\gtrsim 0.95$. Our findings expand the toolbox of magnonics for quantum information purposes.

quant-pharXiv:2607.29206•Aug 3, 2026
Quantum State Transfer Between NV Center -- 13C13_C13C​ System Coupled To A CPW Cavity
Quantum state transfer is a very important process in building a quantum network when information from flying Qubit is transferred to the stationary Qubit in a node via a quantum state transfer. NV centers due to their long coherence time and the presence of nearby 13C13_C13C​ nuclear spin is an excellent candidate for multi-Qubit quantum memory. Here we propose a theoretical description for such a quantum state transfer from a cavity to a nearest neighbour 13C13_C13C​ nuclear spin of a single Nitrogen vacancy center in diamond; it shows great potential in realizing scalable quantum networks and quantum simulation. The full Hamiltonian was considered with the zeroth-order and interaction terms in the Hamiltonian and the theory of effective hamiltonian theory was applied. We study the time evolution of the combined cavity-13C13_C13C​ state through analytical calculation and simulation using QuTip. Graphs for state transfer and fidelity measurement are presented here. We show that our theoretical description verifies a high fidelity quantum state transfer from the cavity to 13C13_C13C​ center by choosing suitable system parameters.
We propose an efficient scheme for transferring quantum states and generating entangled states between two qubits of different nature. The hybrid system consists of a single nitrogen-vacancy (NV) center and a superconducting (SC) qubit, which couple to an optical cavity and a microwave resonator, respectively. Meanwhile, the optical cavity and the microwave resonator are coupled via the electro-optic effect. By adjusting the relative parameters, we can achieve high-fidelity quantum state transfer as well as highly entangled states between the NV center and the SC qubit. This protocol is within the reach of currently available techniques, and may provide interesting applications in quantum communication and computation with single NV centers and SC qubits.
Abstract High‐fidelity universal quantum gates are crucial in quantum computing. Three high‐fidelity universal quantum gates, namely the hybrid controlled NOT gate, the hybrid Toffoli gate, and the hybrid Fredkin gate, on a flying photon qubit and diamond nitrogen‐vacancy (NV) centers, assisted by low‐Q single‐sided cavities, are presented. Errors due to the imperfection of the practical input–output process are detected to improve the fidelity of these quantum gates, which therefore relaxes the requirement on their implementation, since strong coupling is no longer mandatory. In addition, quantum gates have the advantage that they can work faithfully even when the resonant condition among the NV center, the photon, and the cavity is not strictly satisfied, or the NV centers are not identical. The performance and success probability of these quantum gates are analyzed, finding that these schemes are feasible with current technology.
We propose a protocol where chiral magnons mediate a state transfer between two distant spin qubits. The protocol is implemented by varying the coupling between the spin qubits and the magnons in time, such that an arbitrary state is transferred from one qubit to the other. The modulation of the coupling is performed such that the two-spin-qubit state is kept as a dark state of the magnon bath, bypassing the associated losses. We show that the protocol can be realized on a hybrid system composed of two nitrogen-vacancy (NV) centers coupled to the nonreciprocal and chiral magnon modes of an yttrium iron garnet (YIG) stripe. We propose two methods to achieve the time modulation of the NV-magnon coupling: i) the NV-magnet distance of both NV centers is varied; ii) the external magnetic field and the NV-magnet distance of one NV center are varied. We evaluate the implementability of both methods numerically, including the constraints on the temperature, and the dephasing time and minimal lifetime of the spin qubits required for high-fidelity state transfer. We find that using realistic experimental parameters, a state transfer between NV centers at a distance of several microns can be achieved with a fidelity ≳0.95\gtrsim 0.95≳0.95. Our findings expand the toolbox of magnonics for quantum information purposes.