Abstract
A long-sought three-photon version of spontaneous parametric down-conversion, a common technique for entangled photon generation, lays the groundwork for expanded investigations into novel types of quantum entanglements and quantum computing resources.
Highlights
For over 30 years, spontaneous parametric down-conversion (SPDC) has been a workhorse for quantum optics
Using a flux-pumped superconducting parametric cavity, we demonstrate direct three-photon Spontaneous parametric down-conversion (SPDC), with photon triplets generated in a single cavity mode or split between multiple modes
We report an experimental implementation of three-photon SPDC, in the microwave domain, producing generalized squeezed states, in particular, trisqueezed states
Summary
For over 30 years, spontaneous parametric down-conversion (SPDC) has been a workhorse for quantum optics. Spanning frequencies from optical to microwave, SPDC has a central role, for instance, in quantum-limited amplifiers [7] and sources of nonclassical light, including squeezed states [8,9], Fock states [10], and entangled photon pairs [11]. It has more recently been realized that the strong nonlinearity of Josephson junctions facilitates a range of experiments in the microwave domain that are very challenging in the optical domain Following this theme, we report an experimental implementation of three-photon SPDC, in the microwave domain, producing generalized squeezed states, in particular, trisqueezed states. The symmetry properties of these correlations allow us to “fingerprint” the Hamiltonians that created them, clearly demonstrating that states are generated by a family of pure cubic Hamiltonians with little contamination from typical quadratic processes These results form the basis of an exciting new paradigm of three-photon quantum optics
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