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arXiv:1503.00211 · Physical Review A

High-efficiency quantum state transfer and quantum memory using a mechanical oscillator

Eyob Alebachew Sete, Hichem Eleuch

Published Mar 17, 2015• 75 citations
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Abstract

We analyze an optomechanical system that can be used to efficiently transfer a quantum state between an optical cavity and a distant mechanical oscillator coupled to a second optical cavity. We show that for a moderate mechanical $Q$ factor it is possible to achieve a transfer efficiency of $99.4%$ by using adjustable cavity damping rates and destructive interference. We also show that the quantum mechanical oscillator can be used as a quantum memory device with an efficiency of $96%$ employing a pulsed optomechanical coupling. Although the mechanical dissipation slightly decreases the efficiency, its effect can be significantly reduced by designing a high-$Q$ mechanical oscillator.

DOI
10.1103/physreva.91.032309

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We propose a scheme for high fidelity quantum state transfer from a mechanical oscillator to a distant moving atom. In the scheme, two optical cavities connected by an optical fiber are interacted effectively through adiabatically eliminating fiber mode under large detuning limit. The quantum state transfer fidelity can be raised asymptotically to 100% by optimizing the Gaussian pulse G(t), the maximum atom-cavity coupling strength Ωmax, and the atomic velocity v. We also show that the affect of dissipation can be obviously depressed by synchronously increasing Ωmax and v.
We study an optomechanical system in which a microwave field and an optical field are coupled to the same mechanical oscillator. We explore the feasibility of using these mechanical oscillators to store quantum mechanical states and to transduce states between optical and microwave electromagnetic oscillators with special consideration given to the effect of mechanical decoherence. Besides being of fundamental interest, this coherent quantum state transfer could also have important practical implications in the field of quantum information science because it allows one to utilize the advantages while overcoming the intrinsic limitations of both platforms. We discuss several state transfer protocols and study their transfer fidelity using a full quantum mechanical model and implementing quantum state diffusion in order to describe the dissipative effects. We find that a state transfer fidelity of 95% can be achieved for parameters realizable with current experimental technology.
This paper investigates a coupled cavity optomechanical system consisting of two Fabry-Perot cavities and the two cavities are coupled via an optical fiber.Every cavity is made of one fixed mirror and a movable mirror,and the movable mirror can be regarded as a mechanical oscillators.Meanwhile,the two cavity modes are driven by classical laser fields.So,the interaction is inevitable between cavities,cavity and moving mirror,cavity and classical field.Firstly,in order to eliminate the two cavity fields,an effective Hamiltonian of the two phonon modes is derived by means of picture transformation,adiabatic eliminating,and rotating wave approximation ignoring the high frequency items,etc.Secondly,if the two mechanical oscillators initially are in coherent states,the coupled mechanical oscillators can be used to transmit state.Finally,in order to verify the analytical result,the fidelity of quantum state is numevically simulated,the result shows that the quantum state can be transferred periodically between the two mechanical oscillators,which is the same as the analytical result.
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Abstract Systems of coupled mechanical resonators are useful for quantum information processing and fundamental tests of physics. Direct coupling is only possible with resonators of very similar frequency, but by using an intermediary optical mode, non-degenerate modes can interact and be independently controlled in a single optical cavity. Here we demonstrate coherent optomechanical state swapping between two spatially and frequency separated resonators with a mass ratio of 4. We find that, by using two laser beams far detuned from an optical cavity resonance, efficient state transfer is possible. Although the demonstration is classical, the same technique can be used to generate entanglement between oscillators in the quantum regime.