Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Detection of a Quantum Measurement

  1. Apr 25, 2012 #1
    Suppose it is known that a photon has diagonal polarisation (e.g. it has just passed through a diagonal slit), then Alice comes along and measures the photon using a horizontal/vertical polarisation basis. So, I believe there is a 50% chance she will get a horizontal result and 50% chance she will obtain a vertical result.

    Now Bob comes along and also knows the particle has passed through the diagonal slit, but he is unaware that Alice has already made a measurement using a horizontal/vertical basis. Is there an experiment Bob can do to check if the particle's polarisation has been measured?

    Thanks
     
  2. jcsd
  3. Apr 25, 2012 #2

    DrChinese

    User Avatar
    Science Advisor
    Gold Member

    No in this case, and also generally no.
     
  4. Apr 28, 2012 #3
    Hello.

    Measurement of Alice decreases percentage of Bob's finding diagonal polarized photon to 50%, doesn't it?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Detection of a Quantum Measurement
  1. Quantum measurement? (Replies: 23)

  2. Quantum measurement (Replies: 12)

Loading...