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The phosphorus nuclei have a quantum property called spin, which makes them rather like little magnets with poles pointing in particular directions. In an entangled state, the spin of one phosphorus nucleus depends on that of the other.
Put another way, entangled states are really superposition states involving more than one quantum particle.
Fisher says that the quantum-mechanical behaviour of these nuclear spins could plausibly resist decoherence on human timescales. He agrees with Tegmark that quantum vibrations, like those postulated by Penrose and Hameroff, will be strongly affected by their surroundings “and will decohere almost immediately”. But nuclear spins do not interact very strongly with their surroundings.
All the same, quantum behaviour in the phosphorus nuclear spins would have to be “protected” from decoherence.
This might happen, Fisher says, if the phosphorus atoms are incorporated into larger objects called “Posner molecules”. These are clusters of six phosphate ions, combined with nine calcium ions. There is some evidence that they can exist in living cells, though this is currently far from conclusive.
phosphorus: /’fɒsf(ə)rəs/ n. 磷
entangled: /ɪn’tæŋgld/ adj. 卷入的;陷入的
superposition: /ˌsjupəpəˈzɪʃən/ n. 重叠
plausibly: /’plɔ:zəbli/ adv. 似真地
postulated: /’pɑstʃəlet/ adj. 假定的
decohere: /ˌdiko’hɪr/ v. (使)回复灵敏度,(使)散屑
clusters: /’klʌstɚ/ n. 群集；簇
ions: /’aɪən/ n. <物>离子
