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Title: Cooperative pulses for pseudo-pure state preparation

Using an extended version of the optimal-control-based gradient ascent pulse engineering algorithm, cooperative (COOP) pulses are designed for multi-scan experiments to prepare pseudo-pure states in quantum computation. COOP pulses can cancel undesired signal contributions, complementing and generalizing phase cycles. They also provide more flexibility and, in particular, eliminate the need to select specific individual target states and achieve the fidelity of theoretical limit by flexibly choosing appropriate number of scans and duration of pulses. The COOP approach is experimentally demonstrated for three-qubit and four-qubit systems.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Physics Department and Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, 200062 Shanghai (China)
  2. Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, 215163 Suzhou, Jiangsu (China)
  3. Department of Chemistry, Technische Universit√§t M√ľnchen, 85747 Garching (Germany)
Publication Date:
OSTI Identifier:
22300262
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALGORITHMS; FLEXIBILITY; OPTIMAL CONTROL; PULSES; PURE STATES; QUANTUM COMPUTERS; QUANTUM INFORMATION; QUBITS; SIGNALS