Entangling two brains at the quantum level is currently a speculative and highly theoretical concept that goes beyond the current capabilities and understanding of quantum mechanics. As such, discussing the specific details of updating or growing such a quantum entangled brain would be purely speculative.
Quantum entanglement is a phenomenon where two or more particles become correlated in such a way that their quantum states are interdependent, regardless of the physical distance between them. However, entangling entire brains would involve an extraordinary level of complexity and technical challenges that are currently beyond our technological reach.
While it is possible to entangle particles and manipulate their quantum states, extending this concept to the scale of whole brains introduces numerous practical and theoretical difficulties. The brain is an incredibly complex and delicate biological system, and the quantum processes underlying consciousness and cognition are not yet fully understood.
Additionally, it is important to note that entanglement does not allow for instantaneous communication or the direct transfer of complex information between entangled particles. The principles of quantum mechanics, such as the no-communication theorem, restrict the use of entanglement for superluminal (faster-than-light) communication.
In summary, the idea of entangling and updating or growing entire brains at the quantum level is speculative and goes beyond the current capabilities and understanding of quantum physics. While quantum entanglement has profound implications for quantum computing and communication, its application to the human brain is purely theoretical at this point in time.