Engineering the Frequency Spectrum of Bright Squeezed Vacuum via Group Velocity Dispersion in an SU(1,1) Interferometer
arXiv:1610.02344 · doi:10.1103/PhysRevLett.117.183601
Abstract
Bright squeezed vacuum, a promising tool for quantum information, can be generated by high-gain parametric down-conversion. However, its frequency and angular spectra are typically quite broad, which is undesirable for applications requiring single-mode radiation. We tailor the frequency spectrum of high-gain parametric down-conversion using an SU(1,1) interferometer consisting of two nonlinear crystals with a dispersive medium separating them. The dispersive medium allows us to select a narrow band of the frequency spectrum to be exponentially amplified by high-gain parametric amplification. The frequency spectrum is thereby narrowed from (56.5 +- 0.1) to (1.22 +- 0.02) THz and, in doing so, the number of frequency modes is reduced from approximately 50 to 1.82 +- 0.02. Moreover, this method provides control and flexibility over the spectrum of the generated light through the timing of the pump.
6 pages, 5 figures
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- Nonlinear Interferometry for Quantum-Enhanced Measurements of Multiphoton Absorption
- Quantum-enhanced stochastic phase estimation with SU(1,1) interferometer
- Effects of losses on the sensitivity of an actively correlated Mach-Zehnder interferometer
- Two-colour spectrally multimode integrated SU(1,1) interferometer