Proposal for a loophole-free Bell test with electron spins of donors

Details Proposal for a loophole-free Bell test with electron spins of donors Proposal for a loophole-free Bell test with electron spins of donors

2008-03-28

arxiv.org/abs/0803.4102v3

Physics

Quantum Physics

4 pages,4 figures

Scientific paper

10.1103/PhysRevA.77.052113

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 phosphorus donors in semiconductors 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$\mu$s 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.

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