Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session S42: Experimental Progress in Quantum Information Processing with Neutral AtomsInvited
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Sponsoring Units: DAMOP Chair: Vito Scarola, Virginia Tech Room: LACC 502B |
Thursday, March 8, 2018 11:15AM - 11:51AM |
S42.00001: Quantum gates and interfaces with atomic Rydberg interactions Invited Speaker: Mark Saffman Neutral atoms are one of the most promising approaches for scalable quantum information processing. Atomic qubits are all identical, have long coherence times, and can be entangled using long-range Rydberg interactions. I will present experiments showing the creation of entangled |W> states of ~10 atoms, and two-atom Bell states. These experiments, together with the ability to prepare, address, and measure arrays of single atoms provide a partial foundation for future neutral atom based quantum computing. |
Thursday, March 8, 2018 11:51AM - 12:27PM |
S42.00002: Interfering and entangling neutral atoms in optical tweezers Invited Speaker: Cindy Regal I present work that stems from the capability to ground-state laser cool atoms in arrays of movable optical tweezers. This control is relevant to a number of routes to quantum processing with neutral atoms. I will present experiments in which we create and probe entanglement of indistinguishable bosonic atoms using multiple techniques that harness atoms in their electronic ground state. |
Thursday, March 8, 2018 12:27PM - 1:03PM |
S42.00003: Entangling Atomic Spins with a Strong Rydberg-Dressed Interaction Invited Speaker: Grant Biedermann The spin degrees of freedom of ultracold neutral atoms in their ground electronic state provide a natural platform for quantum information processing. Given their long coherence times and our ability to control them with magneto-optical fields, a primary goal of the field is the demonstration of high-fidelity entangling interactions among spins. Toward this end, we have developed a Rydberg-dressed interaction between the spins of individually trapped cesium atoms, which has the advantage of being both tunable and strong, with demonstrated energy shifts of order 1 MHz in units of Planck's constant. We employ this interaction to produce entanglement between neutral atoms and investigate the potential of this technique for high-fidelity quantum control. |
Thursday, March 8, 2018 1:03PM - 1:39PM |
S42.00004: Quantum Computing with Neutral Atoms: Quantum Gates and Maxwell’s Demons Invited Speaker: Aishwarya Kumar I will describe our plans for building a quantum computer based on cesium atoms trapped in a 3D optical lattice. I will detail how, using targeted phase shifts, we implement high fidelity (0.996) and low crosstalk (0.0021) site-selective single qubit gates on any site in a 5x5x5 lattice. We initially load half the lattice sites with a single atom, and after projection sideband cooling 85% of the atoms are in their vibrational ground states. With atoms this cold, most of the system entropy is associated with this random half filling of the lattice. Using site-selective state flips and state-dependent lattice translations, we have prepared nearly perfectly filled sub-lattices. The sorting process can be viewed as an implementation of Maxwell's demon on these ~60 particles. Generation of the initial site-occupancy map lowers the entropy of the system, and the sorting process uses that information to reversibly make a state of manifestly low entropy. Our Maxwell demon increases the phase space density of the system enough so that were the lattice to be adiabatically shut off, the atoms would have crossed the quantum degeneracy threshold. I will also briefly touch upon our plan to implement Rydberg gates in this system to generate entanglement. |
Thursday, March 8, 2018 1:39PM - 2:15PM |
S42.00005: Exploring many-body dynamics on a 51-atom quantum simulator Invited Speaker: Hannes Bernien The realization of large-scale controlled quantum systems is an exciting frontier in modern physical science. In this talk, I will introduce a new platform based on cold atoms in arrays of optical tweezers. We use atom-by-atom assembly to deterministically prepare arrays of individually controlled cold atoms. A measurement and feedback procedure eliminates the entropy associated with the probabilistic trap loading and results in defect-free arrays of over 60 atoms [1]. Strong controllable interactions between these atoms are introduced by exciting them to Rydberg states. The resulting Ising-type interactions lead to entanglement and non-trivial spatial correlations across the array. In particular, we explore adiabatic transitions into crystalline states and study quantum dynamics of this strongly correlated system in the vicinity of a phase transition [2]. Prospects for studying entanglement dynamics in many-body systems and the implementation of quantum algorithms will be discussed. |
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