Manipulating the direction of one-way steering in an optomechanical ring cavity

Abstract

Quantum steering refers to the apparent possibility of exploiting nonseparable quantum correlations to remotely influence the quantum state of an observer via local measurements. Different from entanglement and Bell nonlocality, quantum steering exhibits an inherent asymmetric property, which makes it relevant for many asymmetric quantum information processing tasks. Here, we study Gaussian quantum steering between two mechanical modes in an optomechanical ring cavity. Using experimentally feasible parameters, we show that the state of the two considered modes can exhibit two-way steering and even one-way steering. Instead of using unbalanced losses or noises, we propose a simple practical way to control the direction of one-way steering. A comparative study between the steering and entanglement of the studied modes shows that both steering and entanglement undergo a sudden death-like behavior. In particular, steering is found more fragile against thermal noise remaining constantly upper bounded by entanglement. The proposed scheme may be meaningful for one-sided device-independent quantum key distribution, where the security of such protocol depends fundamentally on the direction of steering.

References in corpus (15)

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• Steering, Entanglement, Nonlocality, and the EPR Paradox
• Optomechanical entanglement between a movable mirror and a cavity field
• Observation of strong coupling between a micromechanical resonator and an optical cavity field
• Radiation-pressure cooling and optomechanical instability of a micro-mirror
• Experimental criteria for steering and the Einstein-Podolsky-Rosen paradox
• Observation of squeezed light with 10dB quantum noise reduction
• Einstein-Podolsky-Rosen steering provides the advantage in entanglement-assisted subchannel discrimination with one-way measurements
• Quantification of Gaussian quantum steering
• Observation of one-way Einstein-Podolsky-Rosen steering
• Multipartite Einstein-Podolsky-Rosen steering and genuine tripartite entanglement with optical networks
• Genuine High-Order Einstein-Podolsky-Rosen Steering
• Full characterization of Gaussian bipartite entangled states by a single homodyne detector
• Bipartite and tripartite output entanglement in 3-mode optomechanical systems
• Einstein-Podolsky-Rosen steering measure for two-mode continuous variable states