Bulletin of the American Physical Society
2018 Annual Meeting of the APS Mid-Atlantic Section
Volume 63, Number 20
Friday–Sunday, November 9–11, 2018; College Park, Maryland
Session D04: Quantum Information |
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Chair: Hilary Hurst, National Institute of Standards and Technology Room: Edward St. John 2204 |
Saturday, November 10, 2018 9:30AM - 10:06AM |
D04.00001: A Quantum computer based on trapped ions Invited Speaker: Norbert M. Linke Trapped ions are a promising candidate system to realize a scalable quantum computer. We present a modular quantum computing architecture comprised of a chain of single 171Yb+ ions with individual laser beam addressing and readout [1]. We use the transverse modes of motion in the chain to produce entangling gates between any qubit pair. This creates a fully connected system which can be configured efficiently to run any sequence of single- and two-qubit gates [2], making it in effect an arbitrarily programmable quantum computer. |
Saturday, November 10, 2018 10:06AM - 10:18AM |
D04.00002: Optimal Entropy Compression in Quantum Bits Varad R Pande Global unitary transformations (optswaps) that optimally increase the bias of any mixed computation qubit in a quantum system – represented by a diagonal density matrix – towards a particular state of the computational basis which, in effect, increases its purity are presented. Quantum circuits that achieve this by implementing the above data compression technique – a generalization of the 3B-Comp [Fernandez, Lloyd, Mor, Roychowdhury (2004); arXiv:quant-ph/0401135] used before – are described. These circuits enable purity increment in the computation qubit by maximally transferring part of its von Neumann or Shannon entropy to any number of surrounding qubits starting with arbitrary initial biases. Using the optswaps, a practicable new method that algorithmically achieves hierarchy-dependent cooling of qubits to their respective limits in an engineered quantum register opened to the environment is delineated. In addition to fundamental quantum thermodynamic interests, this work may be important towards satisfying the DiVincenzo criterion for qubit initialization in some quantum computing architectures. |
Saturday, November 10, 2018 10:18AM - 10:30AM |
D04.00003: Simulation of Nonequilibrium Dynamics on a Quantum Computer Henry S Lamm IV, Scott Lawrence We present a hybrid quantum-classical algorithm for the time evolution of out-of-equilibrium thermal states. The method depends on classically computing a sparse approximation to the density matrix and, then, time-evolving each matrix element via the quantum computer. For this exploratory study, we investigate a time-dependent Ising model with five spins on the Rigetti Forest quantum virtual machine and a one spin system on the Rigetti 8Q-Agave quantum processor. |
Saturday, November 10, 2018 10:30AM - 11:06AM |
D04.00004: Atomic Clocks and their Applications Invited Speaker: Marianna Safronova An extraordinary progress in quantum control and laser technologies led to the development of atomic clocks that will not lose a second in over 10 billion years. Exceptional precision of these clocks will enable many new applications: redefinition of the second, tests of fundamental physics laws, searches for the dark matter, gravitational wave detection, relativistic geodesy, very long baseline interferometry, quantum simulations, and many others. I will give an overview of future clock developments, including the nuclear clock, and their applications, focusing on the potential for quantum-science enabled discoveries. |
Saturday, November 10, 2018 11:06AM - 11:18AM |
D04.00005: Positive Operator Value Measures on Hilbert Spaces Kalindi Gogia A positive operator value measure (POVM) on a separable Hilbert space is defined [2,5 ] to be any sequence of operators on such that for each , is positive and In this paper, we use frames to show the existence of positive operator value measure on a separable Hilbert space and vice versa. Also using frames we shall discuss the average probability of an incorrect quantum measurement. Finally, we relate frames with projective valued measurements. References
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Saturday, November 10, 2018 11:18AM - 11:30AM |
D04.00006: A generalized Arthurs-Kelly protocol for the simultaneous weak measurement of non-commuting observables. Maicol A Ochoa In contrast to a projective quantum measurement, in a weak measurement, the system is only weakly perturbed while only partial information on the measured observable is obtained. During this talk, I will present a protocol for the simultaneous measurement of position and momentum of a quantum system that generalizes the Arthurs and Kelly (AK) approach. Starting with the AK protocol, a systematic extension to a corresponding weak measurement can be obtained along two steps: First, we introduce a Kraus operator that generalizes the transformation of quantum states of a system and detectors during the AK protocol, and demonstrate that this operator constitutes a positive operator valued measure (POVM) in the Hilbert space. Then, we identify the initial detector wavefunctions and the nature of the system-detector interaction that physically reproduces this mathematical construct, providing a complete physical picture for the realization of such weak measurements. Finally, I will compare our approach with alternative protocols recently suggested in the literature. We believe that the results of these investigations provide new insights that will help on the development of quantum control and quantum feedback technologies. |
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