Quantum Computing
The emerging technology that uses quantum mechanical phenomena to perform computations beyond the reach of classical computers, with implications for encryption, medicine, and AI.
OVERVIEW
Quantum computing harnesses quantum mechanical phenomena such as superposition and entanglement to process information in ways classical computers cannot. By the mid-2020s, companies including IBM, Google, and Microsoft have demonstrated quantum processors with over 1,000 qubits. Google's 2019 demonstration of 'quantum supremacy' showed a quantum computer performing a calculation in minutes that would take a classical supercomputer thousands of years. However, practical applications remain limited. The field faces major challenges in error correction, qubit stability, and scaling. If realized, quantum computing could break current encryption standards (including RSA), revolutionize drug discovery, and accelerate AI development. The NSA and other intelligence agencies have invested heavily in post-quantum cryptography.
KNOWN FACTS
Google's Sycamore processor completed a task in 200 seconds that would take Summit supercomputer 10,000 years
The NSA has published post-quantum cryptography standards for industry adoption
Drug discovery simulations on quantum processors have shown initial success for small molecules
Current qubits are 'noisy' and require extensive error correction, limiting practical use
Patent filings for quantum computing have increased exponentially since 2015
CLAIMS
Quantum supremacy has been demonstrated, but practical quantum advantage remains years away
Future quantum computers will break RSA and most current public-key cryptography
Quantum computing could revolutionize drug discovery by simulating molecular interactions
Error-corrected qubits stable enough for practical computation may be 10–15 years away
Governments are secretly advancing quantum computing faster than publicly acknowledged
EVIDENCE FOR
Google's Sycamore processor completed a task in 200 seconds that would take Summit supercomputer 10,000 years
The NSA has published post-quantum cryptography standards for industry adoption
Drug discovery simulations on quantum processors have shown initial success for small molecules
Current qubits are 'noisy' and require extensive error correction, limiting practical use
Patent filings for quantum computing have increased exponentially since 2015
EVIDENCE AGAINST
Google's quantum supremacy claim has been contested; classical algorithms narrowed the gap
No quantum computer has demonstrated a commercially useful advantage over classical systems
Post-quantum cryptography is being standardized and can protect against future quantum attacks
Error correction requires millions of physical qubits for a single logical qubit
The timeline for practical quantum computing has consistently been overestimated
OPEN QUESTIONS
No open questions recorded.
SOURCES
TIMELINE
Shor's algorithm proves quantum computers could factor large numbers
Google claims quantum supremacy with Sycamore processor
IBM unveils 1,121-qubit Condor processor
NIST publishes post-quantum cryptography standards