Simulating the entire universe, including all its particles and interactions, would require an enormous amount of computational power that is currently beyond the capabilities of any known or foreseeable technology, including quantum computers. The universe is incredibly vast and complex, consisting of an astronomical number of particles and interactions at various scales.
The number of qubits needed to simulate the universe would depend on several factors, such as the level of detail and accuracy desired in the simulation. Even with highly simplified models, the computational requirements would still be astronomical.
To put things into perspective, consider that the estimated number of particles in the observable universe is around 10^80. Each particle would require multiple qubits to accurately represent its quantum state. Even if we assume a highly optimistic scenario where each particle only requires one qubit to simulate, we would need a quantum computer with at least 10^80 qubits, which is far beyond the capabilities of current technology.
It's worth noting that simulating the entire universe is not the primary goal of quantum computing. Quantum computers are designed to tackle specific computational problems that are difficult for classical computers, such as optimization, cryptography, and quantum simulations of smaller systems.