= Mark Srednicki
{c}
{tag=Physicist}
A theoretical <physicist> who studied the relation between <entanglement entropy> and boundary area. In his 1993 calculation, a <partial trace> over the interior of an imaginary sphere in a free-field <ground state> leaves a mixed exterior state whose <entropy> scales with area. The example shows how quantum correlations across a boundary can produce an area law without introducing a material surface there.<Entropy and Area by Mark Srednicki>[Abstract: tracing a massless free field over a sphere; coupled-oscillator construction in equations (1)–(5)]{ref}
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