Quantum mechanical nature in liquid NMR quantum computing

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	Quantum mechanical nature in liquid NMR quantum computing
	Long, GL; Yan, HY; Li, YS; Tu, CC; Zhu, SJ; Ruan, D; Sun, Y; Tao, JX; Chen, HM; Long, GL , Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China.
刊名	COMMUNICATIONS IN THEORETICAL PHYSICS
	2002
卷号	38 期号:3 页码:305-308
关键词	Nuclear-magnetic-resonance Search Algorithm Implementation Computation Ensemble Spectroscopy Realization States
ISSN号	0253-6102
英文摘要	The quantum nature of bulk ensemble NAIR quantum computing - the center of recent heated debate, is addressed. Concepts of the mixed state and entanglement arc examined, and the data in a two-qubit liquid NAIR quantum computation are analyzed. The main points in this paper are: i) Density matrix describes the "state" of an average particle in an ensemble. It does not describe the state of an individual particle in an ensemble; ii) Entanglement is a property of the wave function of a microscopic particle (such as a molecule in a liquid NAIR sample), and separability of the density matrix cannot be used to measure the entanglement of mixed ensemble; iii) The state evolution in bulk-ensemble NAIR quantum computation is quantum-mechanical; iv) The coefficient before the effective pure state density matrix, c, is a measure of the simultaneity of the molecules in an ensemble. It reflects the intensity of the NAIR signal and has no significance in quantifying the entanglement in the bulk ensemble NAIR system. The decomposition of the density matrix into product states is only an indication that the ensemble can be prepared by an ensemble with the particles unentangled. We conclude that effective-pure-state NAIR quantum computation is genuine, not just classical simulations.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000178323800010
公开日期	2012-08-29
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/13433]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Long, GL , Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China.
推荐引用方式 GB/T 7714	Long, GL,Yan, HY,Li, YS,et al. Quantum mechanical nature in liquid NMR quantum computing[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2002,38(3):305-308.
APA	Long, GL.,Yan, HY.,Li, YS.,Tu, CC.,Zhu, SJ.,...&Long, GL , Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China..(2002).Quantum mechanical nature in liquid NMR quantum computing.COMMUNICATIONS IN THEORETICAL PHYSICS,38(3),305-308.
MLA	Long, GL,et al."Quantum mechanical nature in liquid NMR quantum computing".COMMUNICATIONS IN THEORETICAL PHYSICS 38.3(2002):305-308.