Zeno and Anti-Zeno Polarization Control of Spin Ensembles by Induced Dephasing

被引：60

作者：

Alvarez, Gonzalo A. ^{[1
,2
]}

Rao, D. D. Bhaktavatsala ^{[3
]}

Frydman, Lucio ^{[3
]}

Kurizki, Gershon ^{[3
]}

机构：

[1] Univ Nacl Cordoba, Fac Matemat Astron & Fis, RA-5000 Cordoba, Argentina

[2] Univ Dortmund, Fak Phys, D-44221 Dortmund, Germany

[3] Weizmann Inst Sci, Dept Chem Phys, IL-76100 Rehovot, Israel

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 16期

关键词：

QUANTUM COHERENCE; HEAT-BATH; IMPLEMENTATION; RESONANCE;

D O I：

10.1103/PhysRevLett.105.160401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We experimentally and theoretically demonstrate the purity (polarization) control of qubits entangled with multiple spins, using induced dephasing in nuclear magnetic resonance setups to simulate repeated quantum measurements. We show that one may steer the qubit ensemble towards a quasiequilibrium state of a certain purity by choosing suitable time intervals between dephasing operations. These results demonstrate that repeated dephasing at intervals associated with the anti-Zeno regime leads to ensemble purification, whereas those associated with the Zeno regime lead to ensemble mixing.

引用

页数：4

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