Hi, can you explain what quantum computers are and why companies are investing in their creation? In particular, I would like to understand the differences between a normal computer and a quantum computer and what this can bring to the world.
Sure, I can explain the basics of quantum computers and their potential applications.

A quantum computer is a type of computer that uses quantum mechanics to process information. Unlike classical computers, which rely on bits that can either be a 0 or a 1, quantum computers use quantum bits, or qubits, which can exist in multiple states at once. This allows quantum computers to perform certain calculations much faster than classical computers, especially for problems that involve large amounts of data or complex algorithms.

One key difference between classical and quantum computers is that quantum computers can perform certain types of calculations in parallel, using a process known as quantum superposition. This means that a quantum computer can simultaneously perform many calculations at once, whereas a classical computer can only perform one calculation at a time.

Another important feature of quantum computers is entanglement, which is a quantum phenomenon where two qubits can be linked in such a way that their states become correlated. This can allow for more efficient communication between different parts of the quantum computer, which can help to speed up calculations.

So why are companies investing in the creation of quantum computers? There are a few reasons. First, quantum computers have the potential to solve certain problems much faster than classical computers, especially in fields such as cryptography, machine learning, and materials science. This could lead to breakthroughs in areas such as drug discovery, financial modeling, and climate modeling.

Second, quantum computers could also help to address some of the limitations of classical computing, such as the so-called combinatorial explosion problem, where the number of possible solutions to a problem grows exponentially with the size of the problem. This makes certain types of problems intractable for classical computers, but quantum computers could potentially provide a more efficient solution.

However, it's important to note that quantum computers are still in the early stages of development, and there are many technical challenges that need to be overcome before they can be widely used. These include issues such as qubit stability, error correction, and scaling up the number of qubits in a system.
I heard that quantum computers operate on qubits, and those are somehow represented by supercooled atoms stored in quantum computers, is this correct?

Also can qubit operations be emulated in normal hardware? I mean, not everybody can afford a quantum computer to play with the basic quantum operations...