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arXiv quant-ph/0312209quant-ph
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等深度量子线路的功率界

Bounds on the Power of Constant-Depth Quantum Circuits

Stephen Fenner, Frederic Green, Steven Homer, Yong Zhang

摘要:

我们表明,如果一种语言是公认的在一定的误差范围内的恒定深度的量子线路在一个有限的家庭门,那么它是可计算的(经典)多项式时间。特别地,我们的结果意味着EQNC^0包含在P中,其中EQNC^0是EQP类的恒定深度模拟。另一方面,我们调整和扩展了Terhal和Dijuenzo(quant-ph/0205133)的思想,以表明对于任何量子门族F(包括Hadamard和CNOT门),计算F上深度为5的电路的接受概率与计算F上电路的接受概率一样困难。特别地,这意味着NQNC^0 = NQACC = NQP = coC=P,其中NQNC^0是类NQP的恒定深度模拟。这从根本上驳斥了格林等人关于NQACC包含在TC中的猜想^[0](quant-ph/0106017)。

英文摘要:

We show that if a language is recognized within certain error bounds by constant-depth quantum circuits over a finite family of gates, then it is computable in (classical) polynomial time. In particular, our results imply EQNC^0 is contained in P, where EQNC^0 is the constant-depth analog of the class EQP. On the other hand, we adapt and extend ideas of Terhal and DiVincenzo (quant-ph/0205133) to show that, for any family F of quantum gates including Hadamard and CNOT gates, computing the acceptance probabilities of depth-five circuits over F is just as hard as computing these probabilities for circuits over F. In particular, this implies that NQNC^0 = NQACC = NQP = coC=P where NQNC^0 is the constant-depth analog of the class NQP. This essentially refutes a conjecture of Green et al. that NQACC is contained in TC^0 (quant-ph/0106017).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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