Repetitive Readout of a Single Electronic Spin via Quantum Logic with Nuclear Spin Ancillae

Robust measurement of single quantum bits plays a key role in the realization of quantum computation and communication as well as in quantum metrology and sensing. We have implemented a method for the improved readout of single electronic spin qubits in solid-state systems. The method makes use of q...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2009-10, Vol.326 (5950), p.267-272
Main Authors: Jiang, L, Hodges, J.S, Maze, J.R, Maurer, P, Taylor, J.M, Cory, D.G, Hemmer, P.R, Walsworth, R.L, Yacoby, A, Zibrov, A.S, Lukin, M.D
Format: Article
Language:English
Subjects:
Classical and quantum physics: mechanics and fields
Depolarization
Diamonds
Electronics
Exact sciences and technology
Logical Thinking
Magnetic fields
Measurement techniques
Memory
Microwave resonance
Microwaves
Nuclear interactions
Nuclear spin
Particle physics
Photons
Physics
Quantum communication
Quantum information
Quantum logic
Quantum theory
Supernova remnants
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Summary:Robust measurement of single quantum bits plays a key role in the realization of quantum computation and communication as well as in quantum metrology and sensing. We have implemented a method for the improved readout of single electronic spin qubits in solid-state systems. The method makes use of quantum logic operations on a system consisting of a single electronic spin and several proximal nuclear spin ancillae in order to repetitively readout the state of the electronic spin. Using coherent manipulation of a single nitrogen vacancy center in room-temperature diamond, full quantum control of an electronic-nuclear system consisting of up to three spins was achieved. We took advantage of a single nuclear-spin memory in order to obtain a 10-fold enhancement in the signal amplitude of the electronic spin readout. We also present a two-level, concatenated procedure to improve the readout by use of a pair of nuclear spin ancillae, an important step toward the realization of robust quantum information processors using electronic- and nuclear-spin qubits. Our technique can be used to improve the sensitivity and speed of spin-based nanoscale diamond magnetometers.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1176496