Bulletin of the American Physical Society
48th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 62, Number 8
Monday–Friday, June 5–9, 2017; Sacramento, California
Session J8: Quantum Metrology, Sensing and Hilbert Space EngineeringInvited
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Chair: Hartmut Haeffner, University of California, Berkeley Room: 314 |
Wednesday, June 7, 2017 2:00PM - 2:30PM |
J8.00001: Trapped atomic ions for quantum-limited metrology. Invited Speaker: David Wineland Laser-beam-manipulated trapped ions are a candidate for large-scale quantum information processing and quantum simulation but the basic techniques used can also be applied to quantum-limited metrology and sensing. Some examples being explored at NIST are: 1) As charged harmonic oscillators, trapped ions can be used to sense electric fields; this can be used to characterize the electrode-surface-based noisy electric fields that compromise logic-gate fidelities and may eventually be used as a tool in surface science. 2) Since typical qubit logic gates depend on state-dependent forces, we can adapt the gate dynamics to sensitively detect additional forces. 3) We can use extensions of Bell inequality measurements to further restrict the degree of local realism possessed by Bell states. 4) We also briefly describe experiments for creation of Bell states using Hilbert space engineering. This work is a joint effort including the Ion-Storage group, the Quantum processing group, and the Computing and Communications Theory group at NIST, Boulder. [Preview Abstract] |
Wednesday, June 7, 2017 2:30PM - 3:00PM |
J8.00002: Precision Spectroscopy in engineered subspaces Invited Speaker: Roee Ozeri Noise limits the coherence of quantum superpositions thus compromising the precision with which spectroscopy can be performed. In the field of quantum information processing several methods were developed that mitigate the effect of noise on quantum coherence. Examples include, dynamic decoupling (DD), decoherence-free-subspaces (DFS) and quantum error-correction codes. In this talk I will describe the use of Hilbert space engineering and dynamic modulation schemes to improve on the precision of spectroscopy in trapped-ion experiments. Specifically I'll show how the sensitivity of force measurements [1] and the measurement accuracy of an atomic quadrupole moment [2] were improved using DD techniques. I'll also show the use of correlated spin Hamiltonians can lead to Heisenberg limited optical clock spectroscopy. Finally I'll discuss how the use of entangled subspaces can improve the accuracy of optical clocks. 1.~~~ R. Shaniv and R. Ozeri,~\underline {arXiv:1602.08645} (2016), Nature Comm., In Press. 2.~~~ R. Shaniv, N. Akerman and R. Ozeri,~\underline {Phys.} Rev. Lett. 116, 140801 (2016) [Preview Abstract] |
Wednesday, June 7, 2017 3:00PM - 3:30PM |
J8.00003: Multi-component quantum gases: Entanglement and Phononic Lamb shift Invited Speaker: Markus Oberthaler Mixtures of quantum gases have been investigated in many different contexts. Here I will present recent results addressing two distinct topics. In the context of spinor condensates I will describe the realization of an atomic SU(1,1) interferometer \footnote{D. Linnemann et al.~ \textbf{Phys.Rev.Lett} 117, 013001 (2016)}. With these experiments we show that time reversal of nonlinear dynamics can be used to utilize many particle entanglement at the Heisenberg limit even in the limit of a noisy atom detector. This opens an alternative route for accessing quantum resources even with limited detection capabilities. As second topic I will report on the first observation of the phononic Lamb shift. It has been predicted in the context of the Fr\" ohlich hamiltonian which describes a particle coupling to excitations of a bosonic system. For the realization we use trapped lithium atoms immersed in a sodium Bose Einstein condensate forming the synthetic vacuum. A precise determination of the self energies with motional Ramsey spectroscopy reveal additional energy shifts to the expected mass renormalization \footnote{T. Rentrop, et al.~ \textbf{Phys.Rev.X} 6, 041041 (2016)}. The minute energyshifts become accessible since the atomic model system allows the direct comparison between quantum vacuum and truely empty space. [Preview Abstract] |
Wednesday, June 7, 2017 3:30PM - 4:00PM |
J8.00004: Entanglement-Enhanced Sensing with Robustness to Noise Invited Speaker: Monika Schleier-Smith In the quest to approach the fundamental Heisenberg limit in atomic precision measurements, central challenges are the generation and detection of highly entangled states. Both of these challenges can be mitigated by using collective interactions to facilitate the readout of an entanglement-enhanced interferometer. Such interaction-based readout can enable spectroscopy near the Heisenberg limit even with noisy state detection, as I will illustrate with a scheme that harnesses non-Gaussian oversqueezed states [{\it Phys. Rev. Lett.} {\bf 116}, 053601 (2016)]. Motivated by this scheme, and by broader prospects in quantum control, I will describe progress in engineering coherent long-range spin interactions among cold atoms strongly coupled to an optical cavity. [Preview Abstract] |
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