ENTANGLEMENT OF ATOMIC-BEAMS - TESTS OF COMPLEMENTARITY AND OTHER APPLICATIONS

It is shown that distinct atomic beams can be entangled when they inte ract with quantum superpositions of macroscopically separated micromas er fields. Experimentally feasible tests of complementarity are propos ed, detecting Ramsey interference (or not) in one and ''Welcher Weg'' information (or not) in the other entangled beam. Available informatio n and fringe contrast can be manipulated using classical and quantum f ields. The ''quantum eraser'' is realized in the former case, while it is only a special feature in the latter one. Other applications of en tangled atoms are also suggested.