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Useful Quantum Computing
Pete Shadbolt
Google Sycamore
54 qubits × 20 clock cycles~100 ft21 million samples200 seconds
Oak Ridge Summit (Schrödinger-Feynman)
54 qubits × ~ 20 clock cycles6,000 ft2
1 million samples10,000 years?
Oak Ridge Summit (Schrödinger)
54 qubits × ~ 20 clock cycles6,000 ft2128PiB SSDArbitrarily many samples6 days
100 101 102 103 104 105 106 107 108
10-1
10-2
10-3
10-4
Error Correction Threshold
GoogleResearchDirection
Useful errorcorrected QC
Near-termapplications
Classicallysimulatable
Number of Qubits
Lim
iting
erro
r rat
e
✓?✘
Figure credit:
108
𝑁𝑁𝑝𝑝ℎ𝑦𝑦𝑦𝑦𝑦𝑦𝑦𝑦𝑦𝑦𝑦𝑦 ~ 10,000 × 𝑁𝑁𝑦𝑦𝑙𝑙𝑙𝑙𝑦𝑦𝑦𝑦𝑦𝑦𝑦𝑦
PsiQ P1*
100 qubits × 1 million clock cyclesFew thousand ft21 million physical qubitsMinutes
Oak Ridge SuperSummit *
100 qubits × 1 million clock cycles6,000 × 2100-54 = 400,000,000,000,000,000 ft2
128 × 2100-54 = 9,000,000,000,000,000 PiB SSDA very long time
❄️Cooling power
⚡️Control electronics
📞📞Connectivity
🏭🏭Manufacturability
1.E-03
1.E-02
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
10mK 10K - Cryostat 10K - Cryoplant
Appr
oxim
ate
avai
labl
e co
olin
g po
wer
(W)
1.E-03
1.E-02
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
1.E+07
1.E+08
1.E+09
Google Sycamore PsiQ Vega PsiQ Polaris
Appr
oxim
ate
trans
isto
r cou
nt