Dense statevector memory

An n-qubit dense statevector stores 2ⁿ complex amplitudes. At 16 bytes per amplitude (two 64-bit real values), its storage is 16 × 2ⁿ bytes. The table describes one statevector, excluding simulator workspace, copies, and metadata.

KiB, MiB, GiB, TiB, and PiB are binary units: each is 1,024 times the previous unit. These figures are a storage baseline, not a runtime estimate or a GPU count. Sparse states and tensor representations can need much less memory; their usefulness depends on the structure retained throughout the computation.

One dense complex128 statevector, from 8 to 50 qubits.
Qubits	Amplitudes	Memory	Bytes
8	256	4 KiB	4,096
10	1,024	16 KiB	16,384
12	4,096	64 KiB	65,536
14	16,384	256 KiB	262,144
16	65,536	1 MiB	1,048,576
18	262,144	4 MiB	4,194,304
20	1,048,576	16 MiB	16,777,216
22	4,194,304	64 MiB	67,108,864
24	16,777,216	256 MiB	268,435,456
26	67,108,864	1 GiB	1,073,741,824
28	268,435,456	4 GiB	4,294,967,296
30	1,073,741,824	16 GiB	17,179,869,184
32	4,294,967,296	64 GiB	68,719,476,736
34	17,179,869,184	256 GiB	274,877,906,944
36	68,719,476,736	1 TiB	1,099,511,627,776
38	274,877,906,944	4 TiB	4,398,046,511,104
40	1,099,511,627,776	16 TiB	17,592,186,044,416
42	4,398,046,511,104	64 TiB	70,368,744,177,664
44	17,592,186,044,416	256 TiB	281,474,976,710,656
46	70,368,744,177,664	1 PiB	1,125,899,906,842,624
48	281,474,976,710,656	4 PiB	4,503,599,627,370,496
50	1,125,899,906,842,624	16 PiB	18,014,398,509,481,984

The Feasibility Suiteevaluates workloads against available classical and quantum resources and reports result quality separately. Explore the interactive memory comparison.