Experimental demonstration of an entanglement swapping operation and improved control in NMR quantum-information processing

Journal Article · Mon Sep 01 00:00:00 EDT 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.68.032305· OSTI ID:20640149

Boulant, N; Pravia, M A; Cory, D G ^[1]; Edmonds, K; Yang, J ^[2]

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1. Department of Nuclear Engineering, MIT, Cambridge, Massachusetts 02139, USA (United States)
2. Center for Materials Science and Engineering, MIT, Cambridge, Massachusetts 02139, USA (United States)

We demonstrate the implementation of an entanglement swapping operation on a four-qubit liquid-state nuclear-magnetic-resonance (NMR) quantum-information processor. We use this experiment as a benchmark to illustrate the progress made in the field of quantum control using strongly modulating pulses and a correction scheme for removing distortions introduced by the nonlinearities in the transmitter and probe circuits. The advances include compensating for incoherent errors caused by the spatial variation of the system Hamiltonian in the NMR sample. The goal of these control sequences is to cause the collapse of the Kraus operator-sum representation of the superoperator into one unitary operator so that the ensemble appears to evolve as one coherent whole.

• OSTI ID: 20640149
• Journal Information: Physical Review. A, Vol. 68, Issue 3; Other Information: DOI: 10.1103/PhysRevA.68.032305; (c) 2003 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BENCHMARKS
CONTROL
CORRECTIONS
CORRELATIONS
DATA PROCESSING
ENERGY LEVELS
ERRORS
HAMILTONIANS
IMPLEMENTATION
INFORMATION THEORY
NONLINEAR PROBLEMS
NUCLEAR MAGNETIC RESONANCE
OPERATION
PROBES
PULSES
QUANTUM MECHANICS
VARIATIONS