Sampling of photon statistics and density matrix using homodyne detection

1996 ◽  
Vol 127 (1-3) ◽  
pp. 144-160 ◽  
Author(s):  
U Leonhardt ◽  
M Munroe ◽  
T Kiss ◽  
Th Richter ◽  
M.G Raymer
Keyword(s):  
Density Matrix ◽  
Photon Statistics ◽  
Homodyne Detection

Sampling of photon statistics and density matrix using homodyne detection (Optics Comm. 127 (1996) 144)

1997 ◽  
Vol 137 (4-6) ◽  
pp. 445
Author(s):  
U Leonhardt ◽  
M Munroe ◽  
T Kiss ◽  
Th Richter ◽  
M.G Raymer
Keyword(s):  
Density Matrix ◽  
Photon Statistics ◽  
Homodyne Detection

Fluctuations, Dissipation, and Noise

2019 ◽  
pp. 325-408
Author(s):  
Peter W. Milonni
Keyword(s):  
Brownian Motion ◽  
Noise Figure ◽  
Heat Bath ◽  
Radiation Reaction ◽  
Langevin Equations ◽  
Photon Statistics ◽  
Laser Linewidth ◽  
Homodyne Detection ◽  
Fluctuation Dissipation ◽  
Fundamental Laser

General concepts in the theory of fluctuations and dissipation are reviewed and applied to examples in quantum optics. Brownian motion, Fokker-Planck and Langevin equations, and the Wiener-Khintchine theorem are reviewed, followed by a derivation and discussion of the fluctuation-dissipation theorem. The general problem of an oscillator coupled to a heat bath is revisited, as is the nonrelativistic theory of radiation reaction. The general ideas about fluctuations and dissipation developed in the first part of the chapter are then applied to the theory of the fundamental laser linewidth, the photon statistics of linear amplifiers and attenuators, the noise figure, amplified spontaneous emission, and the quantum theory of the beam slitter and homodyne detection.

TOWARD A FULL RECONSTRUCTION OF DENSITY MATRIX BY ON/OFF MEASUREMENTS

2009 ◽  
Vol 07 (supp01) ◽  
pp. 27-32 ◽  
Author(s):  
G. BRIDA ◽  
M. GENOVESE ◽  
M. GRAMEGNA ◽  
P. TRAINA ◽  
E. PREDAZZI ◽  
...  
Keyword(s):  
Quantum Mechanics ◽  
Quantum Information ◽  
Density Matrix ◽  
Foundations Of Quantum Mechanics ◽  
Quantum Tomography ◽  
Local Oscillator ◽  
Homodyne Detection ◽  
Short Pulses ◽  
Phase Measurements ◽  
Full Reconstruction

The knowledge of density matrix is fundamental for several applications, ranging from quantum information to the foundations of quantum mechanics and quantum optics. Nevertheless, quantum tomography based on homodyne detection is a rather complicated technique when applied to short pulses in photocounting regime. In this paper, we present an experimental work addressed to test an innovative scheme for a full reconstruction of the density matrix by using on/off detection coupled to phase measurements respect to a local oscillator.

Homodyne detection of the density matrix of the radiation field

1995 ◽  
Vol 52 (3) ◽  
pp. R1801-R1804 ◽  
Author(s):  
G. M. D’Ariano ◽  
U. Leonhardt ◽  
H. Paul
Keyword(s):  
Density Matrix ◽  
Radiation Field ◽  
Homodyne Detection

scholarly journals Distinguishing intrinsic photon correlations from external noise with frequency-resolved homodyne detection

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Carolin Lüders ◽  
Marc Aßmann
Keyword(s):  
Frequency Dependence ◽  
Light Field ◽  
Photon Number ◽  
Intrinsic Noise ◽  
External Noise ◽  
Photon Statistics ◽  
Homodyne Detection ◽  
Noise Sources ◽  
Semiconductor System ◽  
Recorded Data

AbstractIn this work, we apply homodyne detection to investigate the frequency-resolved photon statistics of a cw light field emitted by a driven-dissipative semiconductor system in real time. We demonstrate that studying the frequency dependence of the photon number noise allows us to distinguish intrinsic noise properties of the emitter from external noise sources such as mechanical noise while maintaining a sub-picosecond temporal resolution. We further show that performing postselection on the recorded data opens up the possibility to study rare events in the dynamics of the emitter. By doing so, we demonstrate that in rare instances, additional external noise may actually result in reduced photon number noise in the emission.

STATE MEASUREMENT BY PHOTON FILTERING IN A RING CAVITY

2000 ◽  
Vol 14 (01) ◽  
pp. 15-22 ◽  
Author(s):  
G. M. D'ARIANO ◽  
L. MACCONE ◽  
M. G. PARIS ◽  
M. F. SACCHI
Keyword(s):  
Density Matrix ◽  
Ring Cavity ◽  
Photon Number ◽  
Single Mode ◽  
Photon Statistics ◽  
At Resonance ◽  
State Measurement ◽  
Signal Photon ◽  
Active Ring ◽  
A Chain

We suggest a method for measuring the photon number distribution and the density matrix of a single-mode radiation field. The setup consists of a chain of active ring cavities, each fed by a strong coherent probe and coupled to the signal through cross-Kerr phase modulation. Each cavity is set at resonance by a different Fock component of the signal, so that the detection probability at the cavities output is proportional to the signal photon statistics. The off-diagonal elements of the density matrix can be evaluated by measuring the photon statistics of a set of displaced signal states. The suggested setup allows a reliable state measurement even with low quantum efficiency at detectors.

Non-Collinear Configuration for Dichromatic Squeezing

2001 ◽  
Vol 56 (1-2) ◽  
pp. 165-168
Author(s):  
Alessandra Andreoni ◽  
Maria Bondani ◽  
G. Mauro D ’Ariano ◽  
Matteo G. A. Paris
Keyword(s):  
Laser Pulse ◽  
Nd:Yag Laser ◽  
Second Order ◽  
Photon Statistics ◽  
Homodyne Detection ◽  
Experimental Scheme ◽  
Non Linear ◽  
Linear Interactions

AbstractWe propose a non-collinear experimental scheme for the joint generation of two amplitudesqueezed beams at the frequencies u\ and u>2, fundamental and second harmonics of a Nd:YAG laser pulse. The scheme consists of two successive steps, both involving second-order non-linear interactions in ß - BaB2O4 non-linear crystals. One of the output beams show subPoissonian photon statistics, and this allows to use photodetection instead of homodyne detection for diagnostics

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