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The squashed entanglement of the noiseless quantum Gaussian attenuator and amplifier

机译:无噪声量子高斯衰减器和放大器的压扁纠缠

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We determine the maximum squashed entanglement achievable between sender and receiver of the noiseless quantum Gaussian attenuators and amplifiers and we prove that it is achieved sending half of an infinitely squeezed two-mode vacuum state. The key ingredient of the proof is a lower bound to the squashed entanglement of the quantum Gaussian states obtained applying a two-mode squeezing operation to a quantum thermal Gaussian state tensored with the vacuum state. This is the first lower bound to the squashed entanglement of a quantum Gaussian state and opens the way to determine the squashed entanglement of all quantum Gaussian channels. Moreover, we determine the classical squashed entanglement of the quantum Gaussian states above and show that it is strictly larger than their squashed entanglement. This is the first time that the classical squashed entanglement of a mixed quantum Gaussian state is determined. Published under license by AIP Publishing.
机译:我们确定无噪声量子高斯衰减器和放大器的发件人和接收器之间可实现的最大压扁纠缠,我们证明它可以实现发送一半的无限挤压的两模真空状态。 证据的关键成分是对使用真空状态张集的量子热高斯状态的量子高斯状态的Quantum高斯状态的压扁纠缠的较低的缠结。 这是第一个到Quantum高斯状态的压扁纠缠的第一个下限,并打开了确定所有量子高斯信道的压扁纠缠的方法。 此外,我们确定上述量子高斯状态的经典压扁纠缠,并表明它比其压扁的纠缠更大。 这是第一次确定混合量子高斯状态的经典压扁纠缠。 通过AIP发布在许可证下发布。

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