Quantum Measurement Operations with Nanomagnets and SQUIDs

Details Quantum Measurement Operations with Nanomagnets and SQUIDs Quantum Measurement Operations with Nanomagnets and SQUIDs

1999-08-28

arxiv.org/abs/cond-mat/9908424v1

J. Low T. Phys. 113, 1079 (1998)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 1 figure

Scientific paper

The low-energy behaviour of 2 coupled nanomagnets or 2 coupled SQUIDs, interacting with their environment, can be described by the model of a ``Pair or Interacting Spins Coupled to an Environmental Sea'' (PISCES). These physical systems can then be used for a measurement operation in which system, apparatus and environment are all treated quantum mechanically. We design a ``Bell/Coleman-Hepp'' measuring system, and show that in principle one may design a situation in which quantum interference between system and apparatus can upset the usual measurement operation.

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