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f95toli
Science Advisor
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It is not a BEC, but superconductivity can be used do demonstrate several macroscopic quantum phemomena. The exisitence of the condensate is of course in itself a QM effect, but a somewhat more dramatic demonstration would be macroscopic quantum tunnelling in Josephson junctions and SQUIDs. This was first demonstrated some 25 years ago so it is hardly new.
See e.g. the book on MQT by Takagi
More recently (the past 10 years or so) there have been plenty of demonstrations of superconducting qubits, where large (tens of microns) circuit elements are used.
An even more recent development is the demonstrations of superposition of states in mechanical oscillators. There is a nice TED talk about it by one of the guys who did one of the first experiments.
Hence, it would be silly to argue that QM effects can NOT be observed at the macropscopic scale, there is plenty of experimental evidence.
See e.g. the book on MQT by Takagi
More recently (the past 10 years or so) there have been plenty of demonstrations of superconducting qubits, where large (tens of microns) circuit elements are used.
An even more recent development is the demonstrations of superposition of states in mechanical oscillators. There is a nice TED talk about it by one of the guys who did one of the first experiments.
Hence, it would be silly to argue that QM effects can NOT be observed at the macropscopic scale, there is plenty of experimental evidence.