We consider the change of entanglement of formation $\Delta E$ produced bythe Hadamard-CNOT circuit on a general (pure or mixed) state $\rho$ describinga system of two qubits. We study numerically the probabilities of obtainingdifferent values of $\Delta E$, assuming that the initial state is randomlydistributed in the space of all states according to the product measurerecently introduced by Zyczkowski {\it et al.} [Phys. Rev. A {\bf 58} (1998)883].
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机译：我们考虑了Hadamard-CNOT电路在描述两个量子位系统的一般（纯或混合）状态\\ rho $上产生的形成纠缠度\\ Delta E $的缠结变化。假设初始状态是根据Zyczkowski {\ it et al。}最近引入的乘积来度量的，则我们以数值方式研究了获得不同值$ \ Delta E $的概率，假设初始状态随机分布在所有状态的空间中。修订版A {\ bf 58}（1998）883]。
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