Entanglement creation using quantum interrogation
Abstract
We present some applications of high-efficiency quantum interrogation (``interaction-free measurement'') for the creation of entangled states of separate atoms and of separate photons. The quantum interrogation of a quantum object in a superposition of object-in and object-out leaves the object and probe in an entangled state. The probe can then be further entangled with other objects in subsequent quantum interrogations. By then projecting out those cases in which the probe is left in a particular final state, the quantum objects can themselves be left in various entangled states. In this way, we show how to generate two-, three-, and higher-qubit entanglement between atoms and between photons. The effect of finite efficiency for the quantum interrogation is delineated for the various schemes.
- Publication:
-
Physical Review A
- Pub Date:
- July 2002
- DOI:
- 10.1103/PhysRevA.66.012106
- arXiv:
- arXiv:quant-ph/0112101
- Bibcode:
- 2002PhRvA..66a2106G
- Keywords:
-
- 03.65.Ta;
- 42.50.Ct;
- 03.67.-a;
- Foundations of quantum mechanics;
- measurement theory;
- Quantum description of interaction of light and matter;
- related experiments;
- Quantum information;
- Quantum Physics
- E-Print:
- 7 pages, 13 figures, Submitted to PRA