Tutorial: Quantum Information & Cold Atoms

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Optical Interconnects • A cavity QED implementation Optical cavities connected by a quantum channel Node A Node B Laser • memory: atoms fiber • databus: photons • memory: atoms Laser 32
<strong>Quantum</strong> Communication Protocols • Problem: the basic problem of quantum communication is noise / decoherence Alice Bob |φi A noise ρ 6= |φihφ| pure state mixed state: fidelity F || 1 • Solution: quantum communication in the presence of noise is based on - teleportation - purification (error correction) 33
Page 1 and 2: Tutorial: Quantum Information & Col
Page 3 and 4: Engineering Entangled States We nee
Page 5 and 6: Quantum information processing •
Page 7 and 8: 1. Cold atoms as quantum memory •
Page 9 and 10: Remarks: Traps ... • ion traps 20
Page 11 and 12: Remarks: Traps ... • loading a la
Page 13 and 14: Remarks: Traps ... • magnetic tra
Page 15 and 16: 2. Engineering entanglement: two-qu
Page 17 and 18: Ion Trap Quantum Computer • Cold
Page 19 and 20: Concept 2: two-qubit gates via two-
Page 21 and 22: Entanglement • parallelism e e
Page 23 and 24: • 2 qubit quantum gate |00 |00 |
Page 25 and 26: 3. Mesoscopic atomic ensembles •
Page 27 and 28: Manipulating collective excitations
Page 29 and 30: cont. • qubits | |g N |g N1 q
Page 31: Quantum Communications • classica
Page 35 and 36: Teleportation protocol: 1. Alice pe
Page 37 and 38: 3. Quantum Repeater • classical r
Page 39 and 40: Other (easier?) implementations •
Page 41 and 42: Atomic Ensembles • system: cloud
Page 43 and 44: Continuous Variable Teleportation
Page 45 and 46: Atomic ensembles as quantum memory
Page 47 and 48: Teleportation with coherent light +
Page 49 and 50: 4. Precision measurements • maxim
Page 51 and 52: We compare ... • N independent at
Page 53 and 54: 5. Topological quantum computing co
Page 55 and 56: 1. System: N bosonic atoms • N bo
Page 57 and 58: • interacting atoms - dynamics in
Page 59 and 60: 3. Excitations: ½ anyons • quasi

Tutorial: Quantum Information & Cold Atoms

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