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.
	2002
发表期刊	COMMUNICATIONS IN THEORETICAL PHYSICS
ISSN	0253-6102
卷号	38 期号:3 页码:305-308
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.
部门归属	Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China; Lab Quantum Computat & Quantum Measurement, Beijing 100084, Peoples R China; Tsing Hua Univ, Ctr Atom & Mol Nanosci, Beijing 100084, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA; Tsing Hua Univ, Dept Chem, Beijing 100084, Peoples R China
关键词	Nuclear-magnetic-resonance Search Algorithm Implementation Computation Ensemble Spectroscopy Realization States
学科领域	Physics
URL	查看原文
收录类别	SCI
WOS记录号	WOS:000178323800010
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.itp.ac.cn/handle/311006/13433
专题	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.

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