Room temperature quantum coherence in a potential molecular qubit

Katharina Bader, Dominik Dengler, Samuel Lenz, Burkhard Endeward, Shang-Da Jiang, Petr Neugebauer and Joris van Slageren ()
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Katharina Bader: Institut für Physikalische Chemie, Universität Stuttgart
Dominik Dengler: Institut für Physikalische Chemie, Universität Stuttgart
Samuel Lenz: Institut für Physikalische Chemie, Universität Stuttgart
Burkhard Endeward: Centre for Biomolecular Magnetic Resonance, Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt
Shang-Da Jiang: 1. Physikalisches Institut, Universität Stuttgart
Petr Neugebauer: Institut für Physikalische Chemie, Universität Stuttgart
Joris van Slageren: Institut für Physikalische Chemie, Universität Stuttgart

Nature Communications, 2014, vol. 5, issue 1, 1-5

Abstract: Abstract The successful development of a quantum computer would change the world, and current internet encryption methods would cease to function. However, no working quantum computer that even begins to rival conventional computers has been developed yet, which is due to the lack of suitable quantum bits. A key characteristic of a quantum bit is the coherence time. Transition metal complexes are very promising quantum bits, owing to their facile surface deposition and their chemical tunability. However, reported quantum coherence times have been unimpressive. Here we report very long quantum coherence times for a transition metal complex of 68 μs at low temperature (qubit figure of merit QM=3,400) and 1 μs at room temperature, much higher than previously reported values for such systems. We show that this achievement is because of the rigidity of the lattice as well as removal of nuclear spins from the vicinity of the magnetic ion.

Date: 2014
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DOI: 10.1038/ncomms6304

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