Abstract
Nonclassical beams in high order spatial modes have attracted much interest but they exhibit much less squeezing and entanglement than the fundamental spatial modes, limiting their applications. We experimentally demonstrate the relation between pump modes and entanglement of first-order Hermite Gauss modes (HG10 entangled states) in a type II OPO and show that the maximum entanglement of high order spatial modes can be obtained by optimizing the pump spatial mode. To our knowledge, this is the first time to report this. Utilizing the optimal pump mode, the HG10 mode threshold can be reached easily without HG00 oscillation and HG10 entanglement is enhanced by 53.5% over HG00 pumping. The technique is broadly applicable to entanglement generation in high order modes.
Highlights
Continuous variable (CV) squeezed and entangled states are important in processes such as quantum computation, quantum communication and quantum metrology
In this Express paper, we experimentally demonstrate the relation between pump modes and entanglement of first-order HG modes (HG10 entangled states) in a type II optical parametric oscillator (OPO) and show that the maximum entanglement of high order spatial modes can be obtained by optimizing the pump spatial mode
We experimentally studied HG10 mode entanglement in a type II OPO with three pump modes, HG00, HG20, and a superposition of the two modes
Summary
Nonclassical beams in high order spatial modes have attracted much interest but they exhibit much less squeezing and entanglement than the fundamental spatial modes, limiting their applications. We experimentally demonstrate the relation between pump modes and entanglement of first-order HG modes (HG10 entangled states) in a type II OPO and show that the maximum entanglement of high order spatial modes can be obtained by optimizing the pump spatial mode. To our knowledge, this is the first time to report this. The technique is broadly applicable to entanglement generation in high order modes
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