During post-market trading on September 4, the quantum computing sector exhibited minor fluctuations. As of press time, the four mainstream stocks in the sector showed mixed performance, with IONQ up 0.71% at $39.80, QBTS up 0.06% at $16.59, RGTI up 0.20% at $15.23, and QUBT down 0.40% at $7.98.

In terms of trading volume, post-market activity declined noticeably compared to the regular session. IONQ's post-market volume reached 440,500 shares with turnover of approximately $17.43 million; QBTS traded 140,300 shares with turnover of about $2.33 million; RGTI saw 333,200 shares traded with turnover of roughly $5.07 million; QUBT's post-market volume was 24,400 shares with turnover of approximately $200,000.

Overall, the quantum computing sector showed no significant movement during post-market hours, with all stocks moving less than 1%, indicating investors adopted a wait-and-see approach after the regular session. The sector's intraday trend will require further observation during the next pre-market and regular trading sessions.