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Influence of non-resonant effects on the dynamics of quantum logic gates at room temperature

机译:室温下非谐振效应对量子逻辑门动力学的影响

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We study numerically the influence of non-resonant effects on the dynamics of a single-pi -pulse quantum CONTROL-NOT (CN) gate in a macroscopic ensemble of four-spin molecules at room temperature. The four nuclear spins in each molecule represent a four-qubit register. The qubits are "labeled" by the characteristic frequencies, omega (k), (k = 0-3) due to the Zeeman interaction of the nuclear spins with the magnetic field. The qubits interact with each other through an Ising interaction of strength J. The paper examines the feasibility of implementing a single-pulse quantum CN gate in an ensemble of quantum molecules at room temperature. We determine a parameter region, omega (k) and J, in which a single pulse quantum CN gate can be implemented at room temperature. We also show that there exist characteristic critical values of parameters, Delta omega (cr) = omega (k') - omega (k)(cr) and J(cr), such that for J < J(cr) and omega (k') = omega (k') - omega (k) < omega (cr), non-resonant effects are sufficient to destroy the dynamics required for quantum logic operations. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 32]
机译:我们在数值上研究了非共振效应对室温下四旋分子宏观集合中单π脉冲量子CONTROL-NOT(CN)门动力学的影响。每个分子中的四个核自旋代表一个四量子位的寄存器。由于核自旋与磁场的塞曼相互作用,这些量子位由特征频率ω(k)(k = 0-3)“标记”。量子位通过强度J的Ising相互作用而相互作用。本文研究了在室温下在一组量子分子中实现单脉冲量子CN门的可行性。我们确定一个参数区域ω(k)和J,在其中可以在室温下实现单脉冲量子CN门。我们还显示出存在参数的特征临界值,δomega(cr)= omega(k')-omega(k)(cr)和J(cr),使得对于J ω(k')= ω(k')-ω(k) <Δω(cr),非谐振效应足以破坏量子逻辑运算所需的动力学。 (C)2001 Elsevier Science B.V.保留所有权利。 [参考:32]

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