Abstract
One of the biggest problems in building a quantum computer is noise or decoherence. Qubits are coupled to other systems whether we want them to be or not, e.g., atoms couple to the electromagnetic field and spins couple to other spins via dipole–dipole interactions. These unwanted couplings can cause errors, and we need to protect quantum information against these errors.
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References
J. Preskill, Lecture notes for Physics 219: Quantum Computation. http://www.theory.caltech.edu/people/preskill/ph229/
D.A. Lidar, K.B. Whaley, Decoherence-free subspaces. In Irreversible Quantum Dynamics, ed. by F. Benatti, R. Floreanini. Lecture Notes in Physics, vol. 622 (Springer, Berlin, 2003), p. 83 and quant-ph/0301032
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Bergou, J.A., Hillery, M. (2013). Decoherence and Quantum Error Correction. In: Introduction to the Theory of Quantum Information Processing. Graduate Texts in Physics. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-7092-2_9
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DOI: https://doi.org/10.1007/978-1-4614-7092-2_9
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