Bulletin of the American Physical Society
2013 Joint Meeting of the APS Division of Atomic, Molecular & Optical Physics and the CAP Division of Atomic, Molecular & Optical Physics, Canada
Volume 58, Number 6
Monday–Friday, June 3–7, 2013; Quebec City, Canada
Session M2: Invited Session: Hybrid Quantum Information |
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Chair: Alex Kuzmich, Georgia Institute of Technology Room: 200B |
Thursday, June 6, 2013 8:00AM - 8:30AM |
M2.00001: Information Processing and Precision Measurements using Spin Qubits in Diamond Invited Speaker: Dirk Englund Abstract: The field of quantum optics has led to the development of radically new ways to compute, communicate, and measure with quantum states. Enabled by recent advances in quantum control and nanofabrication, it is now becoming possible to realize quantum technologies in scalable semiconductor systems, building on the dramatic achievements of semiconductor technology in past decades. In the first part of this talk, I will describe our recent work towards photonic integrated chips to control information in the form of single photons and single electron spins in the nitrogen vacancy (NV) center of diamond. The second part of the talk will discuss new directions in precision measurements based on manipulation of the NV spin. This includes the development of electron spin-based optical biosensors and their use in optical imaging and sensing. [Preview Abstract] |
Thursday, June 6, 2013 8:30AM - 9:00AM |
M2.00002: Mechanical Oscillators and Itinerant Microwave Fields Invited Speaker: Tauno Palomaki We demonstrate two types of coherent control of a mechanical oscillator using itinerant microwave fields. In the first protocol, the state of an itinerant microwave fields is coherently transferred into a mechanical oscillator, stored and retrieved on demand. The mechanical oscillator is coupled to a microwave resonator such that the coupling Hamiltonian is capable of exchanging microwave photons and mechanical phonons by applying a detuned microwave pulse. By shaping the envelope of the detuned microwave pulse, we can capture and release itinerant microwave fields with a particular temporal mode. Here we demonstrate protocols for optimal transfer and measure their efficiency using coherent states with energy at the single quantum level. In the second protocol, we use microwave fields to displace the mechanical oscillator in phase space. Crucially, the interaction time for these protocols can be made shorter than the quantum state lifetime of the mechanical oscillator. Finally, we discuss prospects for creating entanglement between itinerant microwave fields and a mechanical oscillator. [Preview Abstract] |
Thursday, June 6, 2013 9:00AM - 9:30AM |
M2.00003: Atom-photon entanglement as a resource for remote entanglement of quantum memories and quantum teleportation Invited Speaker: Wenjamin Rosenfeld Interfacing of atomic systems with photonic communication channels will be the key element in future quantum information processing and communication tasks. In this context, atom-photon entanglement has shown a high potential. Here we present two experiments demonstrating its capabilities: entangling two atomic quantum memories at remote locations and teleportation of the polarization state of a photon onto a memory. We apply the entanglement swapping scheme for generating entanglement between two widely separated memories. It starts by entangling each quantum memory with a photon, which can be conveniently transported via optical fibers. A Bell-state measurement on photons then projects the atomic system onto an entangled state. In our experiment we work with single Rb-87 atoms which are optically trapped in two independent setups separated by 20 meters. By optically exciting the atoms we generate single photons whose polarization is entangled with the atomic spin. Two-photon interference allows us to detect two out of four Bell-states thereby heralding the entanglement of the two atoms. Correlation measurements on the atomic spins reveals a fidelity of the entangled atom-atom state of 0.81 [1]. In the second experiment we performed quantum teleportation of the polarization state of a weak coherent pulse onto the quantum memory. Here we use the same setup where on one side an atom is entangled with a photon. On the other side a weak laser pulse of a certain polarization is prepared, whose spectral and temporal parameters are matched to the single photon emitted by the atom. Again, by means of two-photon interference a Bell-state measurement is performed which enables teleportation of the initially prepared state onto the atom. By performing state tomography we extract the fidelity of the teleported state of 0.82 which is mainly limited by Poissonian photon statistics of the laser pulse.\\[4pt] [1] J. Hofmann, M. Krug, N. Ortegel, L. G\'erard, M. Weber, W. Rosenfeld, H. Weinfurter, ``Heralded entanglement between widely separated atoms,'' Science \textbf{337}, 72 (2012). [Preview Abstract] |
Thursday, June 6, 2013 9:30AM - 10:00AM |
M2.00004: Hybrid atom-membrane optomechanics Invited Speaker: Philipp Treutlein In optomechanics, laser light is used for cooling and control of the vibrations of micromechanical oscillators, with many similarities to the cooling and trapping of atoms. It has been proposed that laser light could also be used to couple the motion of atoms in a trap to the vibrations of a mechanical oscillator. In the resulting hybrid optomechanical system the atoms could be used to read out the oscillator, to engineer its dissipation, and ultimately to perform quantum information tasks. We have experimentally realized a hybrid optomechanical system by coupling ultracold atoms to a micromechanical membrane. The atoms are trapped in an optical lattice, formed by retro-reflection of a laser beam from the membrane surface. We observe both the effect of the membrane vibrations onto the atoms as well as the backaction of the atomic motion onto the membrane. By coupling the membrane to laser-cooled atoms, we engineer the dissipation rate of the membrane. This mechanism can be used to sympathetically cool the membrane with the atoms. The atom-membrane coupling strength can be enhanced by placing the membrane inside an optical cavity. Theoretical investigations show that this gives access to a regime of strong coupling, enabling ground-state cooling and quantum control of the membrane via the atoms. [Preview Abstract] |
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