I'm talking about the superposition principle. They say a quantum system can be in both the 0 and 1 states at the same time. So how does this actually happen physically? I'm getting confused with Schrödinger's cat analogy—is the cat really both dead and alive at the same time? Or is it just a probabilistic state?
How does quantum superposition work?
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Let's start with a classic analogy from the everyday world to understand superposition: think of a coin toss. While the coin is in the air, it is equally likely to land as heads or tails, but it isn't "determined" until someone looks. Similarly, quantum systems (like an electron or photon) exist in superposition until measured—just like the coin in mid-air carrying probabilities of both states. Here, what we call *reality* "collapses" upon observation, much like the coin's outcome is fixed once it hits the ground.
Schrödinger’s cat takes this principle to an extreme in a thought experiment. If a box contains a mechanism triggered by the decay of a radioactive atom—which is in superposition—the cat can, in classical terms, be considered "both alive and dead"—*but only while the box is closed*. Upon opening, the transition from quantum to classical state (the collapse) occurs. So, superposition is really just a probability distribution that gains *reality* through measurement. This blend of physics and philosophy is one of the most exciting aspects of quantum theory!