Proposal for a Loophole-Free Bell Test with Electron Spins of Donors in Silicon

• 作者: Fang-Yu Hong Shi-Jie Xiong Wei Hua Tang Yang Xiang
• 来源期刊: 现代物理(英文)
• 学科: 医学
• 关键词: BELL INEQUALITY Loophole-Free TEST DONOR Spin COHERENT Light
• 年，卷（期）: 2011,（9）
• 页码范围: 1056-1061
• 页数: 6页
• 分类号: R73

摘要

So far, all experimental tests of Bell inequalities which must be satisfied by all local realistic hidden-variable theories and are violated by quantum mechanical predictions have left at least one loophole open. We propose a feasible setup allowing for a loophole-free test of the Bell inequalities. Two electron spin qubits of donors31P in a nanoscale silicon host in different cavities 300 m apart are entangled through a bright coherent light and postselections using homodyne measurements. The electron spins are then read out randomly and independently by Alice and Bob, respectively, with unity efficiency in less than 0.7 μs by using optically induced spin to charge transduction detected by radio-frequency single electron transistor. A violation of Bell inequality larger than 37% and 18% is achievable provided that the detection accuracy is 0.99 and 0.95, respectively.