# Introduction of paper:Soft-Hair-Enhanced Entanglement Beyond Page Curves in a Black Hole Evaporation Qubit Model (aps.org).

In this issue, we present "Phys. Rev. Lett. 120, 181301 (2018) - Soft-Hair-Enhanced Entanglement Beyond Page Curves in a Black Hole Evaporation Qubit Model (aps.org)". .This is an attempt to explain the entropy in black holes and the negative specific heat deadline in Hawking radiation. Hawking radiation in a black hole is the result of antimatter paired with particles being captured by the black hole, resulting in a small amount of radiation. The temperature of this radiation is a few millikelvin, making it difficult to observe at observatories. The entropy produced by this radiation is called the Beckenstein-Hawking entropy, which is a calculation of the entropy of a classical black hole. However, how information is burned away as a black hole evaporates has been a mystery. This paper presents a model of the mechanism along with negative specific heat in the annihilation and state change of qubits. Along with Hawking radiation, the existence of soft-hair radiation with positive specific heat has been predicted for black holes. It is said that the average energy of this radiation is zero, and that it has only the energy of fluctuations due to the uncertainty relation. Taking this, negative specific heat, and black hole evaporation into account, and explaining it in terms of a three-state qubit, it was shown that the entanglement entropy and internal entropy exceed the Beckenstein-Hawking entropy.

In this paper, we describe the Hamiltonian in terms of the generation and annihilation operators of the feather field and the level of the quantum state. The quantum state represents the constituent particles inside a black hole. The lower two levels are degenerate to zero and represent the soft-hair radiation associated with the evaporation of the black hole. The upper level is Hawking radiation. As a result of decoherent time evolution of the Hamiltonian in a unique way, we were able to model how the Hawking radiation causes the constituent particles of a black hole to fall into the lower level and evaporate due to the soft-hair radiation, shrinking the surface area. As a result, it was shown that the entanglement entropy and the internal entropy exceed the Beckenstein-Hawking entropy. The entanglement entropy and internal entropy exceed the Beckenstein-Hawking entropy, indicating that the excited and ground states of the black hole particles are densely entangled. This indicates that the interior of a black hole is not uniformly high-energy, but that there are high-energy particles scattered around like melon bread, and that the proportion of high-energy particles increases with evaporation.

This is a result that can be reproduced by a quantum computer. The question of how to represent the field operator in qubits remains, but it seems to be no problem if more than 50 qubits are available. However, I feel that we will not be able to confirm which of the black hole theories is correct until we are able to actually create a black hole.