三量子比特系统中单个谐振子诱导的量子关联（英文）

Quantum correlations induced by a single harmonic oscillator in three qubits

我们考虑初始无关联并且与由一个谐振子构成的环境之间互相耦合的三量子比特系统.研究了量子比特与环境的耦合强度以及量子比特的初态对量子关联的影响,我们发现环境可以诱导量子关联,提出并证明了四个命题阐述谐振子如何调控三个量子比特中量子关联的分布,并且给出了产生量子关联的条件.特别地,对于弱耦合,我们不但能够获得很多的量子关联,而且还使量子比特系统和环境始终处于分离态.一般地,量子关联动力学是很复杂的,这是由于环境起着两个互相竞争的作用:一方面诱导出各个比特之间的量子关联;另一方面又使它们发生消相干,从而破坏量子关联.

We consider a system of three uncorrelated qubits coupled to a common environment of a single har -monic oscillator.By studying the effects of qubts -environment coupling strength and initial state of the qubits on quantum correlations , we find that the environment can induce quantum correlations , propose and prove four propositions to demonstrate how the single harmonic oscillator mediate the distribution of quantum correlations a -mong three qubits.We obtain the condition under which quantum correlations in any two qubits can be estab -lished.Especially , for weak coupling , we can achieve much amount of quantum correlations between qubits , while the environment remains isolated always from the system .In general , the dynamics of quantum correlations are complicated due to the two competing roles of the environment： inducing entanglement between the qubits and making them decoherent which destroys quantum correlations .