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Coherent analysis of quantum optical sideband modes

Elanor H. Huntington, Gregory N. Milford, Robilliard, C, Timothy C. Ralph

Published Apr 5, 2005• 16 citations
OpenAlex

Abstract

We demonstrate a device that allows for the coherent analysis of a pair of optical frequency sidebands in an arbitrary basis. We show that our device is quantum noise limited and hence applications for this scheme may be found in discrete and continuous variable optical quantum information experiments.

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In the field of quantum information science, the development of quantum resources for generating copious entangled photons remains a critical challenge. Leveraging the broad spectral characteristics of the parametric down-conversion process, numerous sideband modes distributed symmetrically around the squeezed light in the frequency domain exhibit quantum noise correlations analogous to einstein-podolsky-rosen (EPR) entanglement, which also termed as sideband entanglement. Owing to their distinct advantages in deterministic entanglement distribution, high-capacity entanglement generation, and high-efficiency detection, continuous-variable entangled sideband modes hold significant promise for applications in quantum information science. In this paper, the development of quantum sideband entanglement and experimental progress over the past two decades are reviewed.
The quantum noise in photocurrent fluctuations usually gives incomplete information about the quantum state of spectral sideband modes of bright light beams involved in the detection. Each frequency component of the noise spectrum corresponds to two sideband modes symmetrically located around the bright optical field. In the case of the usual homodyne detection, it limits the ability to recover discriminated information of each mode involved. We theoretically show that complete reconstruction of the two-mode quantum state can be obtained by using phase-locked (coherent) resonator detection, even for non-Gaussian states. We experimentally demonstrate the technique by measuring a two-mode displaced coherent state.