Bulletin of the American Physical Society
40th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 54, Number 7
Tuesday–Saturday, May 19–23, 2009; Charlottesville, Virginia
Session X1: Hot Topics |
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Chair: Lou DiMauro, The Ohio State University Room: Chemistry Building 402 |
Saturday, May 23, 2009 10:30AM - 11:00AM |
X1.00001: Towards quantum computing over the rainbow: scalable multipartite entanglement in the optical frequency comb Invited Speaker: Recently, a mapping has been discovered and mathematically proven between the quantum optical eigenmodes of a single cavity and the quantum harmonic oscillators (``qumodes'') entangled in two-dimensional square-grid cluster states suitable for universal quantum computing over continuous variables. This mapping offers serious scaling potential, allowing the entanglement of thousands of qumodes in a single optical parametric oscillator at the only cost of linear increases of pump power and interaction bandwidth. Moreover, the entanglement operation is in constant time versus the size of the cluster state. I will discuss the experimental implementation of these concepts and report on their realization in my laboratory. [Preview Abstract] |
Saturday, May 23, 2009 11:00AM - 11:30AM |
X1.00002: Electron Microscopy of Ultracold Quantum Gases Invited Speaker: Scanning electron microscopy is routinely used to study solid objects on a nanometer scale. Applied to ultracold quantum gases it constitutes a powerful imaging and manipulation technique that combines single atom sensitivity with high spatial resolution. We have adapted a scanning electron microscope for the study of Bose-Einstein condensates of rubidium atoms. The focussed electron beam ionizes the atoms which are subsequently detected. The technique allows for high precision density measurements of the trapped gas with a spatial resolution of better than 150 nm. Loading the condensate in a two-dimensional optical lattice with 600 nm period we demonstrate single site addressability and show that one can produce arbitrary patterns of occupied lattice sites. Such micro-structured quantum gases might become an important resource for the study of mesoscopic quantum systems and future applications in quantum simulation and quantum information processing. Ultimately, we want to employ this technique to make snapshots of the many-body wave function and to get \it in situ \rm access to the quantum correlations of bulk, lattice and low-dimensional quantum systems. [Preview Abstract] |
Saturday, May 23, 2009 11:30AM - 12:00PM |
X1.00003: Synthesizing arbitrary photon states in a superconducting resonator: The quantum digital to analog converter Invited Speaker: Two-level systems, or qubits, can be prepared in arbitrary quantum states with exquisite control, just using classical electrical signals. Achieving the same degree of control over harmonic resonators has remained elusive, due to their infinite number of equally spaced energy levels. Here we exploit the good control over a superconducting phase qubit by using it to pump photons into a high-Q coplanar wave guide resonator and, subsequently, to read out the resonator state. This scheme has previously allowed us to prepare and detect photon number states (Fock states) in the resonator and to measure their decay. Using a generalization of this scheme by Law and Eberly, we can now create arbitrary quantum states of the photon field with up to approximately 10 photons. We analyze the prepared states by directly mapping out the corresponding Wigner function, which is the phase-space equivalent to the density matrix and provides a complete description of the quantum state. [Preview Abstract] |
Saturday, May 23, 2009 12:00PM - 12:30PM |
X1.00004: Plasma-vacuum interface: a new medium for attosecond pulse generation Invited Speaker: The relativistic interaction of an intense laser pulse with overdense plasma constitutes a very promising approach towards the generation of ultra-intense attosecond pulses using novel high-power laser systems currently available or those envisioned for the near future. The plasma medium converts the incident laser light into higher harmonics more efficiently than gaseous media and in addition, it exhibits no inherent limitation on the laser intensity that can be used. To date, substantial theoretical and experimental evidence has been accumulated indicating that the harmonic emission from plasma medium possesses nearly all the essential characteristics required by a source delivering coherent, extreme ultraviolet (XUV) pulses of attosecond duration and unprecedented brightness. Indeed, it was only recently demonstrated that the individual harmonics in the emission spectrum are phase-locked. This is the key requirement for the temporal bunching of the emission to sub-cycle duration. Moreover, our understanding of the generation process has advanced considerably and additional parameters assuring the usability of the source to practical applications have been investigated in detail. The availability of attosecond pulses carrying enough number of photons to enable the performance of XUV-pump XUV-probe type experiments would, for the first time, allow researchers to look at an assortment of dynamic processes requiring attosecond temporal resolution in various branches of physics, chemistry, material science and biology. We will discuss the most recent results pertaining to the development of this new source. [Preview Abstract] |
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