IBM's 120-Qubit 'Cat' State: Quantum Leap Raises Bitcoin Encryption Concerns

2025-10-30 08:59:12

IBM has achieved a breakthrough in quantum computing by entangling 120 qubits in a GHZ “cat state,” pushing the technology closer to levels that could threaten Bitcoin’s cryptographic security.

The 120-Qubit Experiment: A New Benchmark

IBM researchers entangled 120 qubits—the fundamental units of quantum information—into a highly correlated GHZ state, also known as a “cat state” after Schrödinger’s thought experiment. This marks the largest such entanglement to date, with a fidelity of 0.56, meaning the quantum system maintained 56% accuracy despite noise. The experiment, conducted on IBM’s Eagle processor, demonstrates scalable multi-qubit control, a critical step toward practical quantum advantage.

Qubit Count: 120 entangled; previous records ~100.
Fidelity: 0.56; full entanglement verified.
Method: Direct Fidelity Estimation for efficient validation.

GHZ State and Quantum Verification

The GHZ state creates perfect correlation among qubits—one measurement collapses all. IBM used Direct Fidelity Estimation (DFE), a protocol requiring fewer resources than traditional tomography, to confirm the state’s quality. This enables verification of large-scale systems without exponential measurements, accelerating progress toward error-corrected quantum computers.

Implications for Bitcoin and Cryptography

Bitcoin relies on ECDSA for signatures and SHA-256 for hashing, vulnerable to Shor’s algorithm on sufficiently powerful quantum computers. A 120-qubit system is far from the millions needed to break 256-bit keys, but it narrows the gap. Analysts estimate 4,000-13,000 logical qubits for RSA-2048 breaks; Bitcoin’s curve requires similar scale. IBM’s advance signals faster timelines, with post-quantum migration (PQM) urgent for 2025-2030.

Threat Level: Low for now; 120 << millions needed.
Timeline Shift: PQM roadmaps accelerate; NIST standards in 2025.
** BTC Response**: Soft forks for quantum-resistant signatures proposed.

2025 Outlook: Quantum vs. Crypto Race

IBM targets 1,000+ qubits by 2026, with error correction via Qiskit. Bitcoin developers eye lattice-based algorithms for forks. For investors, how to buy Bitcoin via compliant platforms ensures entry. How to sell Bitcoin and how to cash out Bitcoin offer liquidity. Sell Bitcoin for cash and convert Bitcoin to cash enable fiat conversions.

Trading Strategy: Long-Term Hedge

Short-term: Long above $108,500 targeting $115,000, stops at $106,000 (2% risk). Swing: Accumulate dips, staking for 5% APY. Watch quantum news; below $106,000, exit.

In summary, IBM’s 120-qubit cat state advances quantum tech, urging crypto’s post-quantum preparations for 2025’s security evolution.

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