Entropy is one of the most important concepts in physics. In my previous articles, I focused on what entropy is and its relationship with time . As you will remember, entropy is a measure of disorder and is in the positive direction of increase. In this article, I will explain the expression of entropy on quantum computers and its relationship with quantum information in its broadest form. In the last part, we will learn what another important concept, entanglement entropy, means to us. Let's consider a system. The more information we have about this system, the lower the entropy. The opposite is also true. That is, the less information we have about this system, the higher the value of entropy. So entropy is a measure of our ignorance about a system. First, let's define this definition in a classical mathematical way. Next, let's write the equivalent in quantum mechanics. Let's consider two sets A and B. Suppose that sets A and B contain one bit of information. Le...
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