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A hallmark of topological band theory in periodic media is that bulkproperties are not affected by boundary conditions. Remarkably, in certainnon-Hermitian lattices the bulk properties are largely affected by boundaries,leading to such major effects as the non-Hermitian skin effect and violation ofthe bulk-boundary correspondence. Here we unveil that non-unitary discrete-timequantum walks of photons in systems involving gain and loss show rathergenerally non-Bloch parity-time ($\mathcal{PT}$) symmetry breaking phasetransitions, and suggest a bulk probing method to detect such boundary-drivenphase transitions.

Non-Bloch $\mathcal{PT}$ symmetry breaking in non-Hermitian Photonic Quantum Walks