Laser Physics and Quantum Optics Project
Visitors in 2000
A talk in the HIP seminar series on December 21st (Thursday 10.15am in HIP Lecture Room 331):
Creation of superposition states with the stimulated Raman adiabatic passage (STIRAP) method
I describe an efficient and robust method for producing a superposition state of a quantum system, using a sequence of pulses. I show that the mixing angle of the superposition state has a purely geometrical origin, so it is insensitive to small variations of the time-integrated pulse amplitude.
A talk in the HIP seminar series on December 15th (Friday 10.15am in HIP Lecture Room 331):
Quantum networks and computing with photons and collective atomic excitations
Photons are the fastest, most robust and readily available carriers of quantum information. But this information is hard to store and to process. A technique for a loss-free and reversible transfer of the quantum state of photon wave-packets (flying qubits) to collective atomic excitations (stationary qubits) based on so-called dark-state polaritons is described. Application of this technique for quantum memories are discussed. Furthermore the implementation of a quantum logic gate between collective qubits based on dipole-dipole interactions in a frozen Rydberg gas is proposed.