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Despite well-established no-go theorems on a perfect linear optical Bellstate analyzer, we find a numerical trend that appears to approach anear-perfect measurement if we incorporate eight or more un-entangled ancillaphotons into our device. Following this trend, we begin a promising inductiveapproach to building an ideal optical Bell measurement device. In the process,we determine that any Bell state analyzer that (even occasionally) bunches allphotons into only two of the output modes cannot perform an ideal measurementand we find a set of conditions on our linear optical circuit that prevent thisoutcome.

Approaching near-perfect state discrimination of photonic Bell states through the use of unentangled ancilla photons