Quantum measurement and pure dephasing View Full Text


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Article Info

DATE

1997-06

AUTHORS

Benjamin Fain

ABSTRACT

The prerequisite of quantum measurement is a transformation of an initially off-diagonal density matrixρmα;nβ describing an interacting measured object and measuring device into a diagonal density matrixρmα;mαδmnδαβ. The latter density matrix describes a proper mixture of states having definitem-values. On the other hand, the irreversible relaxation (towards the thermodynamic equilibrium) is also characterized by transformation of an initially off-diagonal matrix into a diagonal one. It has been shown that the process of irreversible relaxation can be used to perform quantum measurement, provided the duration Δt of the measurement is much larger thanT2, the phase relaxation time, and much smaller thanT1, the population relaxation time:T2 ≪ Δt ≪T1. Agedanken experiment describing this kind of measurement is provided. Aπ/2-pulse transforms an initialsz = −1/2 state into superposition ofsz = ±1/2 states. The irreversible relaxation leads to the proper mixture ofsz = 1/2 andsz = −1/2 state. Results of the measurements are verified by the second electromagnetic pulse. More... »

PAGES

221-233

References to SciGraph publications

  • 1996-11. Dissipationless states in spin-boson systems in IL NUOVO CIMENTO B (1971-1996)
  • 1988-01. Schrödinger's immortal cat in FOUNDATIONS OF PHYSICS
  • 1980. Theory of Rate Processes in Condensed Media in NONE
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    http://scigraph.springernature.com/pub.10.1007/bf02764205

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    http://dx.doi.org/10.1007/bf02764205

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