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Storage of multiple coherent microwave excitations in an electron spin ensemble

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  • Hua Wu
  • Richard George
  • Janus Wesenberg
  • Klaus Molmer
  • David Schuster
  • Robert Schoelkopf
  • Koehi Itoh
  • Arzhang Ardavan
  • John Morton
  • Andrew Briggs
Article number140503
<mark>Journal publication date</mark>27/09/2010
<mark>Journal</mark>Physical review letters
Issue number14
Number of pages4
Publication StatusPublished
<mark>Original language</mark>English


Strong coupling between a microwave photon and electron spins, which could enable a long-lived quantum memory element for superconducting qubits, is possible using a large ensemble of spins. This represents an inefficient use of resources unless multiple photons, or qubits, can be orthogonally stored and retrieved. Here we employ holographic techniques to realize a coherent memory using a pulsed magnetic field gradient and demonstrate the storage and retrieval of up to 100 weak 10 GHz coherent excitations in collective states of an electron spin ensemble. We further show that such collective excitations in the electron spin can then be stored in nuclear spin states, which offer coherence times in excess of seconds.

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© 2010 The American Physical Society