Discovery of an Unconventional Quantum Echo by Interference of Higgs Coherence
C. Huang, M. Mootz, L. Luo, D. Cheng, J. M. Park, R. H. J. Kim, Y. Qiang, V. L. Quito, Yongxin Yao, P. P. Orth, I. E. Perakis, J. Wang

TL;DR
This paper uncovers an unconventional quantum echo linked to Higgs coherence in superconductors, revealing unique signatures and potential applications in quantum memory and entanglement.
Contribution
It demonstrates the existence of a novel Higgs-related quantum echo with distinctive spectral and temporal features, expanding understanding of Higgs coherence in quantum systems.
Findings
Higgs echo spectral peaks at forbidden frequencies
Asymmetric delay in echo formation
Negative time signals from Higgs-quasiparticle coupling
Abstract
Nonlinearities in quantum systems are fundamentally characterized by the interplay of phase coherences, their interference, and state transition amplitudes. Yet the question of how quantum coherence and interference manifest in transient, massive Higgs excitations, prevalent within both the quantum vacuum and superconductors, remains elusive. One hallmark example is photon echo, enabled by the generation, preservation, and retrieval of phase coherences amid multiple excitations. Here we reveal an unconventional quantum echo arising from the Higgs coherence in superconductors, and identify distinctive signatures attributed to Higgs anharmonicity. A terahertz pulse-pair modulation of the superconducting gap generates a "time grating" of coherent Higgs population, which scatters echo signals distinct from conventional spin- and photon-echoes in atoms and semiconductors. These…
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Taxonomy
TopicsMechanical and Optical Resonators · Atomic and Subatomic Physics Research · Quantum, superfluid, helium dynamics
