Controlling quantum entanglement through photocounts

Details Controlling quantum entanglement through photocounts Controlling quantum entanglement through photocounts

2002-04-11

arxiv.org/abs/quant-ph/0204061v1

Phys. Rev. A 65, 062314 (2002).

Physics

Quantum Physics

12 pages, 3 figures, accepted for publication in Phys. Rev A

Scientific paper

10.1103/PhysRevA.65.062314

We present a protocol to generate and control quantum entanglement between the states of two subsystems (the system ${\cal S}$) by making measurements on a third subsystem (the monitor ${\cal M}$), interacting with ${\cal S}$. For the sake of comparison we consider first an ideal, or instantaneous projective measurement, as postulated by von Neumann. Then we compare it with the more realistic or generalized measurement procedure based on photocounting on ${\cal M}$. Further we consider that the interaction term (between ${\cal S}$ and ${\cal M}$) contains a quantum nondemolition variable of ${\cal S}$ and discuss the possibility and limitations for reconstructing the initial state of ${\cal S}$ from information acquired by photocounting on ${\cal M}$.

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