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arXiv 0805.3452cond-mat.mes-hall
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用约瑟夫森环调制器实现量子极限的模拟信息处理

Analog information processing at the quantum limit with a Josephson ring modulator

N. Bergeal, R. Vijay, V. E. Manucharyan, I. Siddiqi, R. J. Schoelkopf, S. M. Girvin, M. H. Devoret

摘要:

放大器在进行非常灵敏的测量的每个实验中都至关重要。然而,它们总是通过添加噪声来降低信息。量子力学限制了这种退化可以有多小。理论上,相位保持放大器加到它所处理的信号上的最小噪声能量至少相当于信号频率处光子的一半。在这篇文章中,我们表明,我们可以建立一个实用的微波设备,满足最低要求,达到量子极限。这对于固态量子比特的读出非常重要,更一般地说,对于各个科学领域中非常弱的信号的测量非常重要。我们还讨论了如何这个设备可以为各种实际应用,如放大,无噪声频率转换,动态冷却和纠缠信号对的生产的基本积木。

英文摘要:

Amplifiers are crucial in every experiment carrying out a very sensitive measurement. However, they always degrade the information by adding noise. Quantum mechanics puts a limit on how small this degradation can be. Theoretically, the minimum noise energy added by a phase preserving amplifier to the signal it processes amounts at least to half a photon at the signal frequency. In this article, we show that we can build a practical microwave device that fulfills the minimal requirements to reach the quantum limit. This is of importance for the readout of solid state qubits, and more generally, for the measurement of very weak signals in various areas of science. We also discuss how this device can be the basic building block for a variety of practical applications such as amplification, noiseless frequency conversion, dynamic cooling and production of entangled signal pairs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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