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<p>can be measured using von Neumann entropy.</p>

<p>Recently, the field of <a href="page.php?w=quantum_computing">quantum computing</a> has become an active research area because of the possibility to disrupt modern computation, communication, and <a href="page.php?w=cryptography">cryptography</a>.</p>

<p><big> History and development </big></p>
<p><big> Development from fundamental quantum mechanics </big></p>
<p>The history of quantum information theory began at the turn of the 20th century when <a href="page.php?w=classical_physics">classical physics</a> was</p><p>
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