Two-Photon Speckle as a Probe of Multi-Dimensional Entanglement

被引：42

作者：

Beenakker, C. W. J. ^{[1
]}

Venderbos, J. W. F. ^{[1
]}

van Exter, M. P. ^{[2
]}

机构：

[1] Leiden Univ, Inst Lorentz, NL-2300 RA Leiden, Netherlands

[2] Leiden Univ, Huygens Lab, NL-2300 RA Leiden, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 19期

关键词：

INTERFERENCE;

D O I：

10.1103/PhysRevLett.102.193601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We calculate the statistical distribution P(2)(I(2)) of the speckle pattern produced by a photon pair current I(2) transmitted through a random medium, and compare it with the single-photon speckle distribution P(1)(I(1)). We show that the purity of a two-photon density matrix can be directly extracted from the first two moments of P(1) and P(2). A one-to-one relationship is derived between P(1) and P(2) if the photon pair is in an M-dimensional entangled pure state. For M > 1 the single-photon speckle disappears, while the two-photon speckle acquires an exponential distribution.

引用

页数：4

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