Privacy-preserving price e-negotiation (3PEN) is an important topic of secure multi-party computation (SMC) in the electronic commerce field, and the key point of its security is to guarantee the privacy of seller's and buyer's prices. In this study, a novel and efficient quantum solution to the 3PEN problem is proposed, where the oracle operation and the qubit comparator are utilized to obtain the comparative results of buyer's and seller's prices, and then quantum counting is executed to summarize the total number of products which meets the trading conditions. Analysis shows that our solution not only guarantees the correctness and the privacy of 3PEN, but also has lower communication complexity than those classical ones.

翻译：隐私保护的电子价格协商（3PEN）是电子商务领域安全多方计算（SMC）的重要课题，其安全关键在于保障买卖双方定价的隐私性。本研究提出了一种新颖高效的量子解决方案，通过Oracle操作和量子比特比较器获取买卖双方价格的比较结果，进而执行量子计数以统计满足交易条件的商品总数。分析表明，该方案不仅确保了3PEN的正确性与隐私性，且相比经典方案具有更低的通信复杂度。