Estimate the classical memory needed to store the full state vector of a -qubit…

PHYSICS · Subjective · Fermi University Physics · Quantum Information & Technology · Quantum states, measurement and entanglement · Quantum states, measurement and entanglement

Quantum Information and Technology, Ch Qubits, registers and the Bloch sphere

Problem

Estimate the classical memory needed to store the full state vector of a

45

-qubit register in a simulation, if each complex amplitude is stored as two 32-bit (4-byte) floating-point numbers, so

8

bytes per amplitude. Give the answer to two significant figures in terabytes (

1\,\mathrm{TB} = 10^{12}\,\mathrm{bytes}

), and compare it with the

18\,\mathrm{PB}

quoted for a

50

-qubit register stored at

16

bytes per amplitude.

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