Alice and Bob in an expanding spacetime
Alice and Bob in an expanding spacetime
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DOI：
10.1209/0295-5075/111/60001
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发表时间：
2015-09
期刊：
影响因子：
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通讯作者：
H. Alexander;Gustavo de Souza;P. Mansfield;M. Sampaio
中科院分区：
文献类型：
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作者：
H. Alexander;Gustavo de Souza;P. Mansfield;M. Sampaio
研究了渐近平坦的Robertson-Walker扩展时空中两个观察者Alice和Bob之间的量子比特隐形传态。我们使用标量或费米子场模式内爱丽丝和鲍勃的理想腔，并显示退化的隐形传态质量，测量的保真度，通过一个机制所管辖的时空膨胀。这种减少被证明是增加与膨胀的速度和高度敏感的耦合场的时空曲率，变得相当强，因为它减少从共形到最小。我们探索了宇宙学参数的微扰方法来计算博戈柳博夫系数，以评估和比较费米子场和纯量场的保真度退化。
We investigate the teleportation of a qubit between two observers Alice and Bob in an asymptotically flat Robertson-Walker expanding spacetime. We use scalar or fermionic field modes inside Alice's and Bob's ideal cavities and show the degradation of the teleportation quality, as measured by the fidelity, through a mechanism governed by spacetime expansion. This reduction is demonstrated to increase with the rapidity of the expansion and to be highly sensitive to the coupling of the field to spacetime curvature, becoming considerably stronger as it reduces from conformal to minimal. We explore a perturbative approach in the cosmological parameters to compute the Bogoliubov coefficients in order to evaluate and compare the fidelity degradation of fermionic and scalar fields.