Entanglement in fermion systems and quantum metrology

被引：63
作者：
Benatti, F. [1 ,2 ]
Floreanini, R. [2 ]
Marzolino, U. [3 ]
机构：
[1] Univ Trieste, Dipartimento Fis, I-34151 Trieste, Italy
[2] Ist Nazl Fis Nucl, Sez Trieste, I-34151 Trieste, Italy
[3] Univ Ljubljana, Dept Phys, Ljubljana 1000, Slovenia
来源：
PHYSICAL REVIEW A | 2014年 / 89卷 / 03期
关键词：
IDENTICAL PARTICLES; STATES; NOISE; INTERFEROMETER; GASES;
D O I：
10.1103/PhysRevA.89.032326
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Entanglement in fermion many-body systems is studied using a generalized definition of separability based on partitions of the set of observables, rather than on particle tensor products. In this way, the characterizing properties of nonseparable fermion states can be explicitly analyzed, allowing a precise description of the geometric structure of the corresponding state space. These results have direct applications in fermion quantum metrology: Sub-shot-noise accuracy in parameter estimation can be obtained without the need of a preliminary state entangling operation.
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页数：12
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