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IEEE Journal of Quantum Electronics

Electrically Controlled Quantum Memories With a Cavity and Electro-Mechanical System

Li‐Guo Qin, Zhongyang Wang, Gongwei Lin, Jingyun Zhao, Shangqing Gong

Published Dec 18, 2015• 16 citations
Publisher

Abstract

In this paper, we propose a scheme to realize electrically controlled quantum memories in a cavity and electro-mechanical system. By assisting with a constant weak optical field into the high-Q cavity, the electrical manipulations of the dark-state polariton and the group velocity of light are derived. The storage and retrieval of the photon state can be realized and optimized by sending the optimal voltage waveforms in the electric circuit, respectively. In addition, the storage efficiency and the experimental feasibility are discussed. The cavity-induced quantum memory scheme driven by the electric field here has potential applications in future integration and miniaturization of optical information processing devices.

DOI
10.1109/jqe.2015.2509239

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In this paper, we propose a scheme to realize electrically controlled quantum memories in a cavity and electro-mechanical system. By assisting with a constant weak optical field into the high-Q cavity, the electrical manipulations of the dark-state polariton and the group velocity of light are derived. The storage and retrieval of the photon state can be realized and optimized by sending the optimal voltage waveforms in the electric circuit, respectively. In addition, the storage efficiency and the experimental feasibility are discussed. The cavity-induced quantum memory scheme driven by the electric field here has potential applications in future integration and miniaturization of optical information processing devices.
We propose a novel scheme to realize electrically controlled quantum memories in the opto- and electro-mechanical (OEM) cavity. Combining this OEM cavity with the mechanism of Electromagnetically Induced Transparency (EIT) we find that the quantum interference, arising from the two optical transitions of the ΛΛΛ type three-level atomic ensembles, can be manipulated electrically. Numerical calculations show that the probe photon state can be well stored into the atomic spin state by sending an electric current pulse and retrieved with time-reverse symmetry by sending the other current pulse with opposite direction. The quantum interference with electric controlling is expected to apply to other quantum control aspects.
To promote the future quantum information technologies, we demonstrate an electrically driven optical switch based on quantum interference in a hybrid opto-electromechanical system, which consists of an opto-mechanical cavity and an external electric circuit. The key element of our scheme is a moveable mirror of cavity as a charged mechanical oscillator capacitively coupled to a fixed charged plate in a variable capacitor. By adjusting the voltage of the capacitor, the displacement of the moveable mirror is modulated, then the cavity field can be electrically turned on or off due to the detuning of the cavity. Based on the cavity induced transparency, the transparency window can be electrically switched on or off by turning on or off the cavity field. Therefore, the susceptibility of the medium in the cavity can be electrically controlled, i.e., the scheme of the electrically controlled absorption switching can be demonstrated. This electrically driven optical switch will excite a development trend and implementation prospect towards the integration and miniaturization of quantum module device in a chip.
Integrated optical quantum memories are a scalable solution to synchronize a large number of quantum nodes. Without compact quantum memories, some astonishing quantum applications such as distributed quantum computing and quantum sensor networks would not be possible. Rather than find a specific material that meets all the requirements of an on-chip quantum memory as other protocols usually do, we propose to assign the memory requirements on coherent storage and controllability to rare-earth ions and a lithium niobate crystal, respectively. Specifically, optical quantum states are stored in an erbium-doped lithium niobate microcavity by utilizing the electro-optic effect of lithium niobate. The cavity frequency can be shifted by an external electric field, thus modifying the resonance condition between the cavity and the collective atomic excitation. This effect is further used to suppress or enhance the emission of photon echoes. Our calculated results show that high efficiency and a low noise performance are achievable.
In this paper, we theoretically propose a hybrid opto-electro-mechanical-atomic system for image storage. Based on an electromagnetically induced transparency (EIT) scheme, the N-type cold atomic ensemble captured in an optomechanical cavity is used as the storage medium of a two-dimensional image. The results show that the storage process can be modulated through the cavity optomechanical field. It was found that the resolution of reconstructed images can be significantly enhanced by fine-tuning the effective coupling strength between the cavity field and the atomic system. Numerical simulations have revealed that this effective coupling strength is influenced by both frequency detuning and external voltage in our model. Therefore, we can optimize image clarity by adjusting these parameters. This hybrid system merges atomic technology with an opto-electro-mechanical framework, enabling image storage and laying the groundwork for future developments in electrically controlled storage and enhanced quantum storage fidelity.
An ideal and reversible transfer technique for the quantum state between light and metastable collective states of matter is presented and analyzed in detail. The method is based on the control of photon propagation in coherently driven three-level atomic media, in which the group velocity is adiabatically reduced to zero. Form-stable coupled excitations of light and matter (``dark-state polaritons'') associated with the propagation of quantum fields in electromagnetically induced transparency are identified, their basic properties discussed and their application for quantum memories for light analyzed.
The specific features including high factor and long vibration lifetime of nanomechanical resonator (NR) in nano-optomechanical systems have stimulated research to realize some optical devices. In this work, we demonstrate theoretically that it is possible to achieve quantum memory for light on demand via a quantum dot system coupled to a nanomechanical resonator. This quantum memory for light is based on mechanically induced exciton polaritons, which makes the dark-state polariton reaccelerated and converted back into a photon pulse. Our presented device could open the door to all-optical routers for light memory devices and quantum information processing.