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Chinese Physics B

Quantum state transfer via a hybrid solid–optomechanical interface

Pei Pei, Huang He-Fei, Yanqing Guo, Xingyuan Zhang, Jia-Feng Dai

Published Feb 1, 2018• 4 citations
Publisher

Abstract

We propose a scheme to implement quantum state transfer between two distant quantum nodes via a hybrid solid–optomechanical interface. The quantum state is encoded on the native superconducting qubit, and transferred to the microwave photon, then the optical photon successively, which afterwards is transmitted to the remote node by cavity leaking, and finally the quantum state is transferred to the remote superconducting qubit. The high efficiency of the state transfer is achieved by controllable Gaussian pulses sequence and numerically demonstrated with theoretically feasible parameters. Our scheme has the potential to implement unified quantum computing–communication–computing, and high fidelity of the microwave–optics–microwave transfer process of the quantum state.

DOI
10.1088/1674-1056/27/2/024203

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ABSTRACT Based on the hybrid system, we propose a network device to achieve entanglement transfer between multiple superconducting qubits and spatially separated optical cavities. The network model consists of nodes, each equipped with an optical fiber linked to the remote optical cavity. In the central microwave cavity of the network, several superconducting qubits are placed. The protocol begins by initializing superconducting qubits in an entangled state (Bell or GHZ state). By leveraging microwave‐optical photon converters and optical fibers, the entangled states are transferred to spatially separated optical cavities. As a specific example, we numerically demonstrate that the high‐fidelity transfer of a Bell state of superconducting qubits onto spatially separated optical cavities is achievable within the present‐day circuit QED technology. Besides, it is worthy to note that when the dissipation is negligible, the entangled Bell state of spatially separated optical cavities can be transferred back onto superconducting qubits by performing reverse operations. Finally, this proposal is quite general and can be extended to other hybrid systems with resembling level structure. This approach provides a promising candidate for long‐distance entanglement distribution in hybrid quantum networks with potential applications in scalable quantum communication and information processing.
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We describe a new scheme to interconvert stationary and photonic qubits which is based on indirect qubit-light interactions mediated by a mechanical resonator. This approach does not rely on the specific optical response of the qubit and thereby enables optical quantum interfaces for a wide range of solid state spin and charge based systems. We discuss the implementation of state transfer protocols between distant nodes of a quantum network and show that high transfer fidelities can be achieved under realistic experimental conditions.
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.
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