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J. P. Woerdman - One of the best experts on this subject based on the ideXlab platform.

  • Resonant excess Quantum Noise in lasers with mixed guiding
    Optics letters, 2003
    Co-Authors: Y. Lien, M. P. Van Exter, J. P. Woerdman, E. Van Der Togt, N.j. Van Druten
    Abstract:

    We show experimentally that the combination of soft-edged gain and index guiding can lead to resonant excess Quantum Noise. Resonances with excess Noise factors close to 100 are observed in end-pumped Nd3+:YVO4 lasers for cavity lengths in which two modes experience similar gain. An associated increase in the relaxation oscillation damping rate demonstrates that the fluctuation enhancement is indeed caused by excess Quantum Noise and not by dynamic instabilities.

  • Does excess Quantum Noise exist in spontaneous processes
    Optics Communications, 2002
    Co-Authors: Andrea Aiello, M. P. Van Exter, Gerard Nienhuis, J. P. Woerdman
    Abstract:

    We investigate the role of excess Quantum Noise in type-II degenerate parametric down-conversion in a cavity with non-orthogonal polarization eigenmodes. Since only two modes are involved we are able to derive an analytical expression for the twin-photon generation rate measured outside the cavity as a function of the degree of mode non-orthogonality. Contrary to recent claims we conclude that there is no evidence of excess Quantum Noise for a parametric amplifier working so far below threshold that spontaneous processes dominate.

  • Does excess Quantum Noise exist in spontaneous processes?
    Optics Communications, 2002
    Co-Authors: Andrea Aiello, M. P. Van Exter, Gerard Nienhuis, J. P. Woerdman
    Abstract:

    We investigate the role of excess Quantum Noise in type-II degenerate parametric down conversion in a cavity with non-orthogonal polarization eigenmodes. Since only two modes are involved we are able to derive an analytical expression for the twin-photon generation rate measured outside the cavity as a function of the degree of mode nonorthogonality. Contrary to recent claims we conclude that there is no evidence of excess Quantum Noise for a parametric amplifier working so far below threshold that spontaneous processes dominate.Comment: 7 pages, 3 figure in the text. Submitted to Optics Communication

  • A physical explanation of excess Quantum Noise due to non-orthogonal modes
    New Journal of Physics, 2001
    Co-Authors: A.m. Van Der Lee, M. P. Van Exter, N.j. Van Druten, J. P. Woerdman
    Abstract:

    We introduce a physical model of excess Quantum Noise in a laser with non-orthogonal polarization modes. We discuss the cause of the polarization excess Quantum Noise in terms of an injected wave excitation factor. Within this context the excess Noise is due to the fact that the lasing mode is not the polarization state that experiences the highest gain.

  • Quantum Noise of small lasers
    Advances In Atomic Molecular and Optical Physics, 2001
    Co-Authors: J. P. Woerdman, M. P. Van Exter, N.j. Van Druten
    Abstract:

    Publisher Summary This chapter focuses on the quantification of the concept of “small”; this allows one to compare various lasers in a unified framework. This is in fact the realm of mesoscopic lasers—that is, lasers between macroscopic and microscopic. In macroscopic lasers the degrees of freedom of electromagnetic field and gain medium are effectively continuous variables, whereas in mesoscopic lasers they are discrete variables with the one-photon, one-atom laser as ultimate limit. The discreteness introduces Quantum Noise, the more so the smaller the number of degrees of freedom. Because the Quantum Noise depends on details of the system, the universality of the macroscopic laser gets more and more lost the deeper one penetrates into the mesoscopic domain. These generally allow a semiclassical description. A true Quantum description becomes gradually essential, in particular at the end of the route where one reaches the cavity Quantum electrodynamic (QED) limit in the form of a one-atom, one-photon device. The latter may come in many varieties; a good example would be a deterministic device that emits a single photon upon command. The transition between the semiclassical limit and the Quantum limit is of course very vague; this is the realm of mesoscopic physics. The laser threshold transition of a macroscopic laser can be seen as a thermodynamic phase transition in a classical macroscopic system.

N.j. Van Druten - One of the best experts on this subject based on the ideXlab platform.

  • Resonant excess Quantum Noise in lasers with mixed guiding
    Optics letters, 2003
    Co-Authors: Y. Lien, M. P. Van Exter, J. P. Woerdman, E. Van Der Togt, N.j. Van Druten
    Abstract:

    We show experimentally that the combination of soft-edged gain and index guiding can lead to resonant excess Quantum Noise. Resonances with excess Noise factors close to 100 are observed in end-pumped Nd3+:YVO4 lasers for cavity lengths in which two modes experience similar gain. An associated increase in the relaxation oscillation damping rate demonstrates that the fluctuation enhancement is indeed caused by excess Quantum Noise and not by dynamic instabilities.

  • A physical explanation of excess Quantum Noise due to non-orthogonal modes
    New Journal of Physics, 2001
    Co-Authors: A.m. Van Der Lee, M. P. Van Exter, N.j. Van Druten, J. P. Woerdman
    Abstract:

    We introduce a physical model of excess Quantum Noise in a laser with non-orthogonal polarization modes. We discuss the cause of the polarization excess Quantum Noise in terms of an injected wave excitation factor. Within this context the excess Noise is due to the fact that the lasing mode is not the polarization state that experiences the highest gain.

  • Quantum Noise of small lasers
    Advances In Atomic Molecular and Optical Physics, 2001
    Co-Authors: J. P. Woerdman, M. P. Van Exter, N.j. Van Druten
    Abstract:

    Publisher Summary This chapter focuses on the quantification of the concept of “small”; this allows one to compare various lasers in a unified framework. This is in fact the realm of mesoscopic lasers—that is, lasers between macroscopic and microscopic. In macroscopic lasers the degrees of freedom of electromagnetic field and gain medium are effectively continuous variables, whereas in mesoscopic lasers they are discrete variables with the one-photon, one-atom laser as ultimate limit. The discreteness introduces Quantum Noise, the more so the smaller the number of degrees of freedom. Because the Quantum Noise depends on details of the system, the universality of the macroscopic laser gets more and more lost the deeper one penetrates into the mesoscopic domain. These generally allow a semiclassical description. A true Quantum description becomes gradually essential, in particular at the end of the route where one reaches the cavity Quantum electrodynamic (QED) limit in the form of a one-atom, one-photon device. The latter may come in many varieties; a good example would be a deterministic device that emits a single photon upon command. The transition between the semiclassical limit and the Quantum limit is of course very vague; this is the realm of mesoscopic physics. The laser threshold transition of a macroscopic laser can be seen as a thermodynamic phase transition in a classical macroscopic system.

  • Quantum Noise in a laser with nonorthogonal polarization modes
    Physical Review A, 2000
    Co-Authors: A.m. Van Der Lee, M. P. Van Exter, A.l. Mieremet, N.j. Van Druten, J. P. Woerdman
    Abstract:

    We describe the Quantum-Noise behavior of a laser that has nonorthogonal polarization modes. The nonorthogonality of the modes leads to excess Quantum Noise. Theoretically, we derive the excess Noise dynamics of the laser, including the saturation of the gain medium. Experimentally, we have measured the Noise dynamics in the polarization, intensity and phase degrees of freedom of a 3.51-µm HeXe laser and we obtain good agreement with theory. When the modes are made nonorthogonal we observe: (i) excess intensity and phase Noise, (ii) spectral coloring of the excess intensity Noise and (iii) correlations between the polarization-angle Noise and the intensity Noise. The excess phase Noise is found to be partly suppressed by the polarization-anisotropic part of the saturation of the gain medium.

  • Excess Quantum Noise is colored
    Physical Review Letters, 1998
    Co-Authors: A.m. Van Der Lee, M. P. Van Exter, A.l. Mieremet, N.j. Van Druten, J. P. Woerdman
    Abstract:

    Whereas Quantum Noise in a laser is essentially white, we show that excess Quantum Noise is colored. The coloring is determined by both the geometry (nonorthogonality) and the dynamics (eigenvalues) of the eigenmodes of the laser resonator. Experimentally, we demonstrate these concepts by using nonorthogonal polarization modes. We also show that the induced correlations between the modes can be used to greatly reduce the excess Quantum Noise.

M. P. Van Exter - One of the best experts on this subject based on the ideXlab platform.

  • Resonant excess Quantum Noise in lasers with mixed guiding
    Optics letters, 2003
    Co-Authors: Y. Lien, M. P. Van Exter, J. P. Woerdman, E. Van Der Togt, N.j. Van Druten
    Abstract:

    We show experimentally that the combination of soft-edged gain and index guiding can lead to resonant excess Quantum Noise. Resonances with excess Noise factors close to 100 are observed in end-pumped Nd3+:YVO4 lasers for cavity lengths in which two modes experience similar gain. An associated increase in the relaxation oscillation damping rate demonstrates that the fluctuation enhancement is indeed caused by excess Quantum Noise and not by dynamic instabilities.

  • Does excess Quantum Noise exist in spontaneous processes
    Optics Communications, 2002
    Co-Authors: Andrea Aiello, M. P. Van Exter, Gerard Nienhuis, J. P. Woerdman
    Abstract:

    We investigate the role of excess Quantum Noise in type-II degenerate parametric down-conversion in a cavity with non-orthogonal polarization eigenmodes. Since only two modes are involved we are able to derive an analytical expression for the twin-photon generation rate measured outside the cavity as a function of the degree of mode non-orthogonality. Contrary to recent claims we conclude that there is no evidence of excess Quantum Noise for a parametric amplifier working so far below threshold that spontaneous processes dominate.

  • Does excess Quantum Noise exist in spontaneous processes?
    Optics Communications, 2002
    Co-Authors: Andrea Aiello, M. P. Van Exter, Gerard Nienhuis, J. P. Woerdman
    Abstract:

    We investigate the role of excess Quantum Noise in type-II degenerate parametric down conversion in a cavity with non-orthogonal polarization eigenmodes. Since only two modes are involved we are able to derive an analytical expression for the twin-photon generation rate measured outside the cavity as a function of the degree of mode nonorthogonality. Contrary to recent claims we conclude that there is no evidence of excess Quantum Noise for a parametric amplifier working so far below threshold that spontaneous processes dominate.Comment: 7 pages, 3 figure in the text. Submitted to Optics Communication

  • A physical explanation of excess Quantum Noise due to non-orthogonal modes
    New Journal of Physics, 2001
    Co-Authors: A.m. Van Der Lee, M. P. Van Exter, N.j. Van Druten, J. P. Woerdman
    Abstract:

    We introduce a physical model of excess Quantum Noise in a laser with non-orthogonal polarization modes. We discuss the cause of the polarization excess Quantum Noise in terms of an injected wave excitation factor. Within this context the excess Noise is due to the fact that the lasing mode is not the polarization state that experiences the highest gain.

  • Quantum Noise of small lasers
    Advances In Atomic Molecular and Optical Physics, 2001
    Co-Authors: J. P. Woerdman, M. P. Van Exter, N.j. Van Druten
    Abstract:

    Publisher Summary This chapter focuses on the quantification of the concept of “small”; this allows one to compare various lasers in a unified framework. This is in fact the realm of mesoscopic lasers—that is, lasers between macroscopic and microscopic. In macroscopic lasers the degrees of freedom of electromagnetic field and gain medium are effectively continuous variables, whereas in mesoscopic lasers they are discrete variables with the one-photon, one-atom laser as ultimate limit. The discreteness introduces Quantum Noise, the more so the smaller the number of degrees of freedom. Because the Quantum Noise depends on details of the system, the universality of the macroscopic laser gets more and more lost the deeper one penetrates into the mesoscopic domain. These generally allow a semiclassical description. A true Quantum description becomes gradually essential, in particular at the end of the route where one reaches the cavity Quantum electrodynamic (QED) limit in the form of a one-atom, one-photon device. The latter may come in many varieties; a good example would be a deterministic device that emits a single photon upon command. The transition between the semiclassical limit and the Quantum limit is of course very vague; this is the realm of mesoscopic physics. The laser threshold transition of a macroscopic laser can be seen as a thermodynamic phase transition in a classical macroscopic system.

Radim Filip - One of the best experts on this subject based on the ideXlab platform.

  • Quantum Noise eater for a single photonic qubit
    New Journal of Physics, 2013
    Co-Authors: Miroslav Gavenda, Lucie Čelechovská, Miloslav Dušek, Radim Filip
    Abstract:

    We propose a Quantum Noise eater for a single qubit and experimentally verify its performance for recovery of a superposition carried by a dual-rail photonic qubit. We consider a case when only one of the rails (e.g. one of interferometric arms) is vulnerable to Noise. A coherent but randomly arriving photon penetrating into this single rail causes a change of its state, which results in an error in a subsequent Quantum information processing. We theoretically prove and experimentally demonstrate a conditional full recovery of the superposition by this Quantum Noise eater.

Miroslav Gavenda - One of the best experts on this subject based on the ideXlab platform.

  • Quantum Noise eater for a single photonic qubit
    New Journal of Physics, 2013
    Co-Authors: Miroslav Gavenda, Lucie Čelechovská, Miloslav Dušek, Radim Filip
    Abstract:

    We propose a Quantum Noise eater for a single qubit and experimentally verify its performance for recovery of a superposition carried by a dual-rail photonic qubit. We consider a case when only one of the rails (e.g. one of interferometric arms) is vulnerable to Noise. A coherent but randomly arriving photon penetrating into this single rail causes a change of its state, which results in an error in a subsequent Quantum information processing. We theoretically prove and experimentally demonstrate a conditional full recovery of the superposition by this Quantum Noise eater.