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Quantum Information Storage for over 180 s Using Donor Spins in a 28 Si “Semiconductor Vacuum”

2012; American Association for the Advancement of Science; Volume: 336; Issue: 6086 Linguagem: Inglês

10.1126/science.1217635

1095-9203

Michael F. Steger, K. Saeedi, M. L. W. Thewalt, John J. L. Morton, H. Riemann, N. V. Abrosimov, Peter Becker, H.‐J. Pohl,

Electron Spin Resonance Studies

Extending Quantum Memory Practical applications in quantum communication and quantum computation require the building blocks—quantum bits and quantum memory—to be sufficiently robust and long-lived to allow for manipulation and storage (see the Perspective by Boehme and McCarney ). Steger et al. (p. 1280 ) demonstrate that the nuclear spins of 31 P impurities in an almost isotopically pure sample of 28 Si can have a coherence time of as long as 192 seconds at a temperature of ∼1.7 K. In diamond at room temperature, Maurer et al. (p. 1283 ) show that a spin-based qubit system comprised of an isotopic impurity ( 13 C) in the vicinity of a color defect (a nitrogen-vacancy center) could be manipulated to have a coherence time exceeding one second. Such lifetimes promise to make spin-based architectures feasible building blocks for quantum information science.