Experimental investigation of decoherence in maximally entangled mixed states

Minaru Kawamura; Takuji Morimoto; Takashi Kumaya; Ryuichi Sawae; Kenichi Takarabe; Yoshinori Manmoto

doi:10.1002/qua.20658

Experimental investigation of decoherence in maximally entangled mixed states

International Journal of Quantum Chemistry ◽

10.1002/qua.20658 ◽

2005 ◽

Vol 105 (6) ◽

pp. 750-757 ◽

Cited By ~ 4

Author(s):

Minaru Kawamura ◽

Takuji Morimoto ◽

Takashi Kumaya ◽

Ryuichi Sawae ◽

Kenichi Takarabe ◽

...

Keyword(s):

Experimental Investigation ◽

Mixed States

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Experimental Investigation of the Robustness of a New Bell-Type Inequality of Triphoton GHZ States in Open Systems

Entropy ◽

10.3390/e23111514 ◽

2021 ◽

Vol 23 (11) ◽

pp. 1514

Author(s):

Jiaqiang Zhao ◽

Meijiao Wang ◽

Lianzhen Cao ◽

Yang Yang ◽

Xia Liu ◽

...

Keyword(s):

Experimental Investigation ◽

Noise Intensity ◽

Open Systems ◽

Type Inequality ◽

Particle Systems ◽

Mixed States ◽

Quantum Bit ◽

Ghz States ◽

Information Fidelity ◽

Different Levels

Knowing the level of entanglement robustness against quantum bit loss or decoherence mechanisms is an important issue for any application of quantum information. Fidelity of states can be used to judge whether there is entanglement in multi-particle systems. It is well known that quantum channel security in QKD can be estimated by measuring the robustness of Bell-type inequality against noise. We experimentally investigate a new Bell-type inequality (NBTI) in the three-photon Greenberger–Horne–Zeilinger (GHZ) states with different levels of spin-flip noise. The results show that the fidelity and the degree of violation of the NBTI decrease monotonically with the increase of noise intensity. They also provide a method to judge whether there is entanglement in three-particle mixed states.

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The timescales of granular segregation in horizontally shaken monolayers

Proceedings of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rspa.2013.0203 ◽

2013 ◽

Vol 469 (2157) ◽

pp. 20130203 ◽

Cited By ~ 9

Author(s):

D. Pihler-Puzović ◽

T. Mullin

Keyword(s):

Experimental Investigation ◽

Particle System ◽

Thin Layers ◽

Complex Structures ◽

Control Parameters ◽

Mixed States ◽

Segregation Phenomenon ◽

Granular Segregation ◽

Individual Particles

The results of an experimental investigation of segregation phenomenon in thin layers of a binary multi-particle system on a horizontal vibrating tray are discussed. Complex structures are observed to emerge from initially mixed states and result from interaction of individual particles. Qualitatively different segregation states are found which have disparate timescales and these are shown to have a systematic dependence on the control parameters.

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