Amplification, squeezing and entanglement generation with electrical circuits
Event details
| Date | 15.10.2010 |
| Hour | 11:00 |
| Speaker | Prof. Konrad Lehnert - JILA Colorado |
| Location | |
| Category | Conferences - Seminars |
In an increasing number of experiments, information is encoded in the modulation of a pure quantum state of a microwave signal. For example, the state of superconducting qubits and the position of mechanical oscillators have been efficiently encoded into states of the microwave field. In contrast, the ability to extract the information from the microwave signal is not as advanced. The best available microwave measurement technology adds noise forty times larger than the quantum fluctuations present in the microwave field. In this talk, I will describe our effort to develop tools for measuring microwave signals that introduce much less noise than those quantum fluctuations. The key element of these tools is a type of Josephson parametric amplifier (JPA), which exploits the electrical nonlinearity of Josephson junctions. We now use these amplifiers to routinely approach quantum limited performance in several different experiments, including quantum nanomechanics and the readout of astrophysical detectors. In this talk, I will describe how we use the JPA to tomographically reconstruct a squeezed state of a microwave field, which was itself created with a JPA. Because pairs of squeezed states can be combined to create entangled modes of the microwave field, they form the basis of a general quantum information processing strategy. We are evaluating this strategy, known as continuous variables quantum information, by attempting to realize quantum teleportation between microwave electrical circuits
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