PIRSA:07060015 Conference Quantum Information

DOI10.48660/07060015

Conference/School: The Fourth Annual Canadian Quantum Information Students' Conference - 2007

Ryan, C. (2007). Purifying qubits in NMR quantum information processing. Perimeter Institute. https://pirsa.org/07060015

Ryan, Colm. Purifying qubits in NMR quantum information processing. Perimeter Institute, Jun. 02, 2007, https://pirsa.org/07060015 

@misc{ pirsa_PIRSA:07060015,
  doi = {10.48660/07060015},
  url = {https://pirsa.org/07060015},
  author = {Ryan, Colm},
  keywords = {Quantum Information},
  language = {en},
  title = {Purifying qubits in NMR quantum information processing},
  publisher = {Perimeter Institute},
  year = {2007},
  month = {jun},
  note = {PIRSA:07060015 see, \url{https://pirsa.org}}
}

Abstract

Any implementation of  a quantum computer will require the ability to reset qubits to a pure input state, both to start the computation and more importantly to implement fault-tolerant operations.  Even if we cannot reset to a perfectly pure state, heat-bath algorithmic cooling provides a method of purifying mixed states.  By combining the ability to pump entropy out of the system through a controllable interaction with a heat bath and coherent control of the qubits, we are able to cool a subset of the qubits far below the heat bath temperature.  Here we show an implementation of this cooling in a solid state NMR quantum information processor which offers high fidelity control of the qubit system and controllable access to a heat bath.   We demonstrate an implementation of multiple rounds of heat-bath algorithmic cooling on three qubits and discuss the improvements in control techniques which have allowed us to show the purification of a single qubit to one and a half times the heat bath polarization.

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