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Hello friends,
I have two questions.The single photon means an excited atom emits a single photon.
One, if a single photon has the property of wave?
Two, if a single photon is a wave packet? i.e. if a single photon hasIn quantum field theory
a width of frequency, but not monochromatic?
2
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A_{\mu}(x)= | d^3 k / (a_{k,i} A_{\mu}(k,i;x) + a*_{k,i} A*_{\mu}(k,i;x)
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/ i=1
Here creation operator a_{k,i} creats an single photon with
polarization i and frequency k. Thus for a single photon, it must be
absolutely monochromatic. While for wave packet, it is a fourier
expansion of variable frequency, may be k+-dk. For a wave packet the
frequency has a width dk, but not a define and single freqency.
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k-dk k k+dk
From this point of wiew, one may say that a single photon is not apacket. That is why I asked if a single photon is a wave packet?
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Best regards,
Qiang