Discussion Overview
The discussion revolves around the behavior of a photon’s spin after it has been dis-entangled from another photon, particularly focusing on the time frame and conditions under which the photon retains its spin state. The conversation includes elements of quantum mechanics, measurement, and the implications of entanglement.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant questions how long, on average, a photon retains its spin after dis-entanglement, using a hypothetical scenario involving two entangled photons measured at different times.
- Another participant suggests that if Bob's photon does not interact with anything after Alice measures hers, it will remain in a spin state (spin down) as determined by Alice's measurement.
- A participant raises a question about the implications of Bob changing his measurement from spin down to spin up, suggesting a potential change in Alice's measurement outcome.
- There is a clarification that when Alice measures her photon, Bob's photon is still considered to be in a superposition state until a measurement is made, referencing the linearity of the Schrödinger equation.
- Participants discuss the concept of "no definite state," with one asserting that the collapse of the wave function is instantaneous and questioning the nature of the system being discussed.
- Another participant reiterates that Bob's photon cannot remain in an indefinite state after a measurement is made.
- One participant emphasizes that according to standard quantum mechanics, no measurement occurs until an interaction is made.
Areas of Agreement / Disagreement
Participants express differing views on the implications of measurement and the state of the photons after dis-entanglement. There is no consensus on how long a photon retains its spin or the effects of subsequent measurements.
Contextual Notes
Discussions include assumptions about measurement, the nature of entanglement, and the interpretation of quantum mechanics, which remain unresolved and may depend on specific definitions and interpretations.