On Wednesday, January 8th, U.S. stocks showed mixed performance. The S&P 500 rose by 0.16% to 5,918.25 points, the Dow Jones increased by 0.25% to 42,635.20 points, while the Nasdaq decreased by 0.06% to 19,478.88 points.

As the global economic recovery inches forward, the movements in the U.S. stock market have piqued general interest once more. Despite stability in recent trading sessions, the major indices opened with slight declines: the Dow Jones Industrial Average dropped by 0.01%, the Nasdaq Composite fell by 0.10%, and the S&P 500 Index slipped 0.03%. This has raised questions about whether the current state of U.S. equities is a sign of deeper market shifts.

In the background, more intricate factors may be shaping investor confidence and decision-making. Notably, Nvidia's CEO, Jensen Huang's recent comments have sparked considerable discussion in the quantum computing sector. Huang suggests that practical applications of quantum computing may still be at least 15 years away, igniting introspection on the future trajectory of technological advancements. Such sentiments have led to a notable offload in quantum-computing-focused stocks, with Quantum Computing and Rigetti Computing noting declines, compelling investors to reevaluate their expectations.

Quantum computing represents a frontier in contemporary technology, providing novel methodologies for tackling complex computations. While its theoretical underpinnings and preliminary applications have emerged, practical commercial deployment continues to face numerous technical hurdles. This reality is mirrored in the declining prices of quantum computing stocks, indicating a reevaluation by investors of future market potentials.

In the landscape of investment psychology, attitudes towards future technological advancements significantly influence market trends, particularly so in high-tech domains like quantum computing, where uncertainties abound. The lure of rapid innovation and potential high returns has attracted substantial capital, yet the unproven nature and elongated development timelines breed anxiety among investors.

Furthermore, the future of quantum computing intersects with national science and technology strategies on a macro scale. Although the U.S. maintains a lead, increased investments from Europe and China aim to close the gap. Hence, quantum computing extends beyond individual corporate competition to global innovation strategies, influencing the broader competitive advantage within the tech industry.

In conclusion, while immediate stock market performance may appear stable, volatility in quantum computing equities reflects underlying market disquiet. Anticipation surrounding quantum computing's eventual market entry must manage investor expectations by balancing engagement with technological progression against the risk factors.

The ongoing challenge for investors lies in precisely assessing the prospects and perils of emerging technologies. Despite breakthroughs, the important conversation remains on mitigating risks while seizing opportunities in this era of transformation. There’s hope for quantum computing to deliver new possibilities in the future, yet such advances will require sustained multi-faceted efforts well beyond isolated technological strides.