SHENZHEN, China, July 9, 2026 /PRNewswire/ -- MicroCloud Hologram Inc. (NASDAQ: HOLO), ("HOLO" or the "Company"), a technology service provider, has made an important breakthrough centered on the NISQ (Noisy Intermediate-Scale Quantum) environment — the practical approximate quantum multiplier technology. This technology takes approximate computing as its core idea and conducts systematic optimization targeting the two key performance bottlenecks of quantum circuit depth and T-gate count, providing a feasible path that balances efficiency and precision for current noisy quantum devices.
HOLO first started from the most basic arithmetic unit — the adder — and performed a structural reconstruction of the traditional quantum adder circuit. Standard quantum adders usually rely on a bit-by-bit carry propagation mechanism, with circuit depth growing linearly with the number of input bits and requiring a large number of T gates to implement non-Clifford operations. In the newly proposed approximate adder, by weakening the carry precision of some low-weight bits and truncating or simplifying the originally strictly executed carry chain, a constant-depth (O(1)) circuit structure is achieved. This design is not a simple deletion of logic, but ensures through probability analysis and error modeling that the impact of errors on the overall computation remains within an acceptable range.
At the specific implementation level, the technology proposes four approximate adder circuits with different precision levels. These circuits introduce parameterized control mechanisms during design, allowing users to flexibly choose between precision and resource consumption according to specific application requirements. For example, in application scenarios with low error sensitivity, a highly compressed version of the adder can be selected to achieve extremely low circuit depth and T-gate count; while in scenarios requiring higher computational precision, a more complete carry path can be enabled to improve result accuracy. This adjustable precision design concept enables quantum arithmetic modules to possess performance gear characteristics similar to those in classical computing for the first time.
After completing the construction of the approximate adder, HOLO further used it as a core module to build a complete approximate quantum multiplier. Unlike traditional multipliers that rely on multi-stage addition accumulation structures, this multiplier achieves significant simplification of the overall circuit structure by optimizing some product generation paths and combining them with approximate addition units. Particularly in terms of T-gate count, the technology significantly reduces implementation costs by decreasing the number of high-cost non-Clifford gates used. This is especially important in current quantum hardware architectures, because T gates typically require complex fault-tolerant encoding and magic state distillation processes to implement, with resource overhead far higher than that of Clifford gates.