Which of the following require energy?(adsbygoogle = window.adsbygoogle || []).push({});

- change the spin of photon

- entangle photons

- disentangle photons

- change the phase of a photon

- change the wavelength/frequency of a photon

- cause a delay in path of a photon (by each of the various methods)

- change the direction of a photon (reflection/transmission)

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# Is any energy required to change the spin of a photon?

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