#4344 24-Qubit Emulation on a Laptop with RTX 4080 with 12 Gbytes VRAM
#4344 24-Qubit Emulation on a Laptop with RTX 4080 with 12 Gbytes VRAM #4344 Is it better to simulate qubits at 4 Ghz and 64 Mbytes of RAM, or on a laptop RTX 4080 with 12 Gbytes VRAM? When it comes to simulating qubits, "better" is almost entirely defined by how many qubits you can actually fit into memory. In this matchup, the laptop RTX 4080 (12 GB VRAM) isn't just better; it is the only viable option for any meaningful work. The primary bottleneck for quantum simulation is the exponential memory requirement for the statevector . To track the state of $n$ qubits, you need to store $2^n$ complex numbers. The Numbers: 64 MB vs. 12 GB Here is how that memory translates into simulation capacity using standard 128-bit (complex128) precision: Memory Max Qubits (Statevector) Performance Context 64 MB (RAM) 21 Qubits Roughly equivalent to an early 2000s desktop. You'll run out of memory before the 4 GHz CPU even breaks a sweat. 12 GB (VRAM) 29 Qubits Modern research g...