QIP seminar, Wed 10/22, 3:00, 36-428, William Oliver

Abstract:

In this talk, we will present an overview of our superconductive quantum
computing effort. In collaboration with Lincoln�s Solid State Division (Division
and the MIT campus, we have fabricated superconductive artificial atoms,
actively cooled them to near absolute zero, and demonstrated new
broadband spectroscopy techniques along with the more conventional Rabi,
Ramsey, and spin-echo metrics to characterize their coherence. These
artificial atoms form the fundamental building blocks, �qubits,� of a quantum information processor. We
have developed and simulated a universal set of gate operations capable of low error rates to control
these qubits. Today, we are working to improve single-qubit coherence while coupling these qubits
into more complicated circuit elements. The talk will present a review of our progress and future work.

————————————————-

http://qis.mit.edu

http://mailman.mit.edu/mailman/listinfo/qip-sem

QIP seminar, Mon 10/20, 4:15, 36-428, Kenneth Brown

MIT Quantum Information Processing seminar
Monday 10/20 at 4:15 in 36-428
——————————

——————-

Kenneth Brown (Georgia Institute of Technology)

Quantum Simulations and Errors

Abstract:

A quantum simulation is a map of the dynamics of a target quantum
system onto a control quantum system. A quantum computer is a control
quantum system that can simulate any target quantum system. In this
talk, we describe two cases of quantum simulations in the presence of
errors. In the first case, we examine a control quantum system that
simulates the target system in an interaction picture. Although the
control system simulates the dynamics, it does not simulate the
thermodynamics of the target system. This is an important distinction
when the target system represents a Hamiltonian with proposed
error-correcting properties. In the second case, we use a model of a
fault-tolerant quantum architecture to evaluate the resource cost of
evaluating the ground state energy of the target quantum system. The
resources are compared to performing Shor’s algorithm on the same
model.  Simulations of modest accuracy on 10’s of qubits are found to
have comparable cost, in the product of computational time and space
(KQ), to the factoring of 1024 bit numbers.

————————————————-
http://qis.mit.edu
http://mailman.mit.edu/mailman/listinfo/qip-sem

Nanoscale magnetic sensing with an individual electronic spin in diamond

J. R. Maze¹, P. L. Stanwix², J. S. Hodges^1,3, S. Hong¹, J. M. Taylor⁴, P. Cappellaro^1,2, L. Jiang¹, M. V. Gurudev Dutt⁵, E. Togan¹, A. S. Zibrov¹, A. Yacoby¹, R. L. Walsworth^1,2 & M. D. Lukin¹

1. Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
2. Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA
3. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
4. Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02138, USA
5. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA

A categorical semantics of quantum protocols

Samson Abramsky and Bob Coecke

Oxford University Computing Laboratory

Revista Boliviana de Física

Publicación del Instituto de Investigaciones Físicas de la Universidad Mayor de San Andrés y de la Sociedad Boliviana de Física