Direct state tomography using continuous variable measuring device

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• 作者：Xuanmin Zhu ; ^{zhuxuanmin@xidian.edu.cn} ; Qun Wei
• 关键词：Quantum state tomography ; Weak value ; Reconstructed state
• 刊名：Annals of Physics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：376
• 期：Complete
• 页码：283-295
• 全文大小：881 K
• 卷排序：376

文摘

Compared with the conventional quantum state tomography (QST), the efficiency of the direct state tomography (DST) using weak value is very low. However, DST is easily manipulated in experiments. We modify the direct state tomography by using coupling-deformed observables. The modified direct state measurement is valid for arbitrarily large measurement strength. The optimal measurement strengths are obtained to attain the highest efficiency. The efficiency of DST is significantly improved in the modified strategy, and the reconstructed state has no inherent bias. The state reconstruction strategy investigated in this paper might be useful in actual experiments.