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Entangled Economies: Quantum Trading, Infinite Run Times, and the W State
Quantum Computing Newsletter 🤖
Bell State
October 05, 2025
Welcome to The Bell State.
Your weekly roundup of the biggest breakthroughs in Quantum Computing
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HSBC & IBM trial quantum-enabled algorithmic bond trading with positive results
HSBC demonstrates first known “quantum-enabled” algorithmic trading in bond markets with IBM (Source)
Their trial produced an up to 34% improvement in predicting bond-trade outcomes or customer inquiry success in European corporate bond markets.
The experiment underscores a hybrid quantum-classical workflow: not replacing classical systems wholesale but enhancing particular subroutines.
Still, the claims have drawn scrutiny; skeptics point to noise, overfitting, and question whether gains would hold at scale.
Takeaway: Real-world financial applications are coming into view. But converting experimental quantum advantage into robust, scalable performance in live markets remains a major hurdle.
Harvard/MIT advance quantum run times via atom replacement techniques
Researchers engineer a quantum system that can run continuously for over two hours (Source)
The team used an “optical lattice conveyor belt” and optical tweezers to dynamically replace lost atoms in a 3,000-qubit system, maintaining coherence over a long duration.
They can replace qubits at a rate of ~300,000 atoms per second to repair defects and sustain operations.
The researchers project that systems capable of “indefinite run time” (i.e. continuous error correction/adaptive repair) may be possible within ~3 years.
Takeaway: Longevity and error correction are among the biggest bottlenecks in practical quantum computing. This work edges the field closer to systems that can run “forever,” not just for a few milliseconds or seconds.
Japan scientists crack the “W state,” advancing teleportation & entanglement control
Japanese researchers finally exact the W state, opening new quantum teleportation paths (source)
The W state is a specific entanglement class of multiple qubits/particles with robust properties; realizing it has been a long-standing challenge.
This breakthrough may allow more flexible or robust quantum teleportation protocols and potentially better entanglement distribution schemes.
It helps deepen fundamental control over multipartite entanglement, a critical resource in advanced quantum communication and computing architectures.
Takeaway: Quantum progress doesn’t just need more qubits — it needs better control of delicate states. Achieving difficult entangled forms like the W state is a stepping stone toward scalable quantum communication and networked devices.
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