Quantum state reconstruction of spectral field modes: Homodyne and resonator detection schemes

Author(s)

Barbosa, F. A. S. ^[1] ; Coelho, A. S. ^[1] ; Cassemiro, K. N. ^[2] ; Nussenzveig, P. ^[1] ; Fabre, C. ^[3] ; Villar, A. S. ^[2] ; Martinelli, M. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil

^[2] Univ Fed Pernambuco, Dept Fis, BR-50670901 Recife, PE - Brazil

^[3] Univ Paris 06, Lab Kastler Brossel, F-75252 Paris - France

• Document type: Journal article
• Source: Physical Review A; v. 88, n. 5 NOV 14 2013.
• Web of Science Citations: 8

Abstract

We revisit the problem of quantum state reconstruction of light beams from the photocurrent quantum noise. As is well known, but often overlooked, two longitudinal field modes contribute to each spectral component of the photocurrent (sideband modes). We show that spectral homodyne detection is intrinsically incapable of providing all the information needed for the full reconstruction of the two-mode spectral quantum state. Such a limitation is overcome by the technique of resonator detection. A detailed theoretical description and comparison of both methods is presented, as well as an experiment to measure the six-mode quantum state of pump-signal-idler beams of an optical parametric oscillator above the oscillation threshold. (AU)

• FAPESP's process: 10/08448-2 - Quantum information with continuous variables of atoms and light
• Grantee: Paulo Alberto Nussenzveig
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 09/52157-5 - Teleportation of quantum information between different colors
• Grantee: Marcelo Martinelli
• Support Opportunities: Regular Research Grants
• FAPESP's process: 10/52282-1 - Quantum information processing with continuous variables
• Grantee: Marcelo Martinelli
• Support Opportunities: Regular Research Grants