Simultaneous quantum-state measurements using array detection
Abstract
We have simultaneously measured the quantum states of two different spatial modes of the same optical beam by performing quantum-state tomography with an array detector. Both modes are well described by coherent states, but the projection of the signal onto the local oscillator mode contains a mean of 0.09 photons, while a more complicated mode has a mean of 4.3 photons. This demonstrates that for this particular mode the effective detection efficiency when using array detection is over 40 times greater than when using single detectors.
- Publication:
-
Physical Review A
- Pub Date:
- April 2001
- DOI:
- 10.1103/PhysRevA.63.040101
- Bibcode:
- 2001PhRvA..63d0101D
- Keywords:
-
- 03.65.Wj;
- 03.65.Ta;
- 42.50.Ar;
- State reconstruction quantum tomography;
- Foundations of quantum mechanics;
- measurement theory;
- Photon statistics and coherence theory