1999
DOI: 10.1119/1.19192
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Illustrative example of Feynman’s rest of the universe

Abstract: Coupled harmonic oscillators occupy an important place in physics teaching. It is shown that they can be used for illustrating an increase in entropy caused by limitations in measurement. In the system of coupled oscillators, it is possible to make the measurement on one oscillator while averaging over the degrees of freedom of the other oscillator without measuring them. It is shown that such a calculation would yield an increased entropy in the observable oscillator. This example provides a clarification of … Show more

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Cited by 74 publications
(107 citation statements)
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References 29 publications
(43 reference statements)
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“…4) Необходимо отметить, что выражения, которым можно было бы придать вид (8) и (9), впер-вые фактически появились в работах Блоха [15] и Вигнера [16], хотя и в ином контексте. В по-следующие годы они использовались и другими авторами для решения ряда частных задач (см., например, [17]- [19]). …”
Section: эффективная температураunclassified
“…4) Необходимо отметить, что выражения, которым можно было бы придать вид (8) и (9), впер-вые фактически появились в работах Блоха [15] и Вигнера [16], хотя и в ином контексте. В по-следующие годы они использовались и другими авторами для решения ряда частных задач (см., например, [17]- [19]). …”
Section: эффективная температураunclassified
“…Note that at this point, squeezing is merely in the collective modes. On the other hand, as discussed in Reference [37], the ground state wave function of the coupled harmonic oscillator system is separable in their collective modes. In both cases, entanglement and squeezing relates uniquely as given by Equation (7) and (31).…”
Section: Analytical Derivation On the Dynamical Relation Between Quanmentioning
confidence: 99%
“…Indeed, the position uncertainty squeezing and the entanglement entropy of the ground state of this oscillator have been solved analytically by previous studies [36,37] as follows:…”
Section: Dynamical Relation Of Quantum Squeezing and Entanglement In mentioning
confidence: 99%
“…Thus, it can be diagonalized by a unitary transformation. If this matrix is normalized so that its trace is one, it becomes a density matrix [16,17]. Table 3.…”
Section: Jones Vectors and Stokes Parametersmentioning
confidence: 99%