Google’s Quantum Fidelity: Progress and Future Directions

Recent advancements in quantum computing at Google reveal an impressive fidelity rate of 99.99%. This statistic measures how closely the output states align with the researchers’ targeted outcomes. However, this figure pertains only to those states that successfully passed a stringent inspection process.

The success rate in preparation and measurement phases shows that approximately 8% of attempts result in usable states. For every set of 100 trials, this means only about eight yield satisfactory results post-evaluation.

Next Steps in Quantum Research

Looking ahead, the researchers aim to scale the process significantly while ensuring that the produced states remain practical for subsequent, more complex calculations. There is an acknowledged need for further improvement in real-time operational capabilities along with enhancing the arrangement for error corrections.

Relation to Previous Research

In March, Google shared projections indicating that a future superconducting quantum computer equipped with fewer than 500,000 physical qubits could potentially compromise the cryptographic security employed by Bitcoin and Ethereum, assuming specific hardware capabilities are met.

In a September report by CoinDesk, researchers identified strategies to streamline the computational workload necessary for executing an attack on these cryptocurrencies. This research addressed only a segment of the overall computational challenge, excluding the entire attack vector and the associated physical resource costs.

While these studies aim to simplify the math for potential blockchain adversaries, they also highlight the expense involved in maintaining quantum systems during complex calculations. It should be noted that the improvements in efficiency from various studies cannot simply be added together. Google’s earlier estimates inherently assumed effective production of magic states.

Thus, the current explorations serve to validate part of the engineering required without necessarily suggesting a cumulative reduction in the expected costs associated with attacks on Bitcoin or Ethereum.