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This is fundamental theoretical physics on dynamical quantum phase transitions in open chains, where boundary effects and complex momenta produce new transition behaviour that persists in the thermodynamic limit. The results are early-stage and lack a demonstrated device or application, so the relevance for quantum control hardware and computing remains speculative. Readers should treat the "control via surroundings" claim as a research direction, not a near-term capability.
Researchers Measure Topological Shifts Using Particle Count
Unlike typical quantum transitions defined by system size, this work demonstrates how open chain ends fundamentally alter behaviour, persisting infinitely as chains grow longer. These newly discovered ‘non-Bloch’ phase changes rely on complex momentum and reveal a surprising link between boundary conditions and environmental interactions. A nonzero point-gap winding number dictates these shifts in energy and timing, offering potential control over quantum systems via their surroundings.
A new type of dynamical quantum phase transition, non-Bloch DQPTs, alters both the speed of changes and overall energy in systems when specific topological conditions are met, even at infinite chain length. Zhesen Yang, Wei-Wei Yang, Henning Schomerus, and Jiangping Hu detailed these transitions which occur only in open chains; they arise from complex momenta than those typically seen in periodic structures. These “non-Bloch DQPTs” represent a novel quantum transition occurring at material edges that differs from typical transitions happening throughout a substance. This boundary…
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