Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:0811.2654 · Physical Review Letters

Experimental Inhibition of Decoherence on Flying Qubits via “Bang-Bang” Control

Sajeev Damodarakurup, Marco Lucamarini, Giovanni Di Giuseppe, David Vitali, P. Tombesi

Published Jul 22, 2009• 96 citations
arXivHTMLPDF

Abstract

Decoherence may significantly affect the polarization state of optical pulses propagating in dispersive media because of the unavoidable presence of more than a single frequency in the envelope of the pulse. Here we report on the suppression of polarization decoherence in a ring cavity obtained by properly retooling for photonic qubits the "bang-bang" protection technique already employed for nuclear spins and nuclear-quadrupole qubits. Our results show that bang-bang control can be profitably extended to quantum information processes involving flying polarization qubits.

DOI
10.1103/physrevlett.103.040502

Related papers

Inhibition of decoherence in flying qubits

Sajeev Damodarakurup, Marco Lucamarini, Giovanni Di Giuseppe +2 more

In recent years the interest in the manipulation of quantum systems has furthered new strategies for maintaining their coherence, continuously threatened by unwanted and uncontrollable interactions with the environment. Photons interact weakly with the surroundings. Even so decoherence may significantly affect their polarization state during the propagation within dispersive media because of the unavoidable presence of more than a single frequency in the envelope of the photon pulse. Here we report on a suppression of the polarization decoherence in a ring cavity obtained by properly retooling for the photon qubit the "bang-bang" protection technique already employed for nuclear spins and nuclear-quadrupole qubits. Our results show that bang-bang control can be profitably extended to all quantum information processes involving flying polarization qubits.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•May 4, 2009•0 citations

Bang-bang decoupling used in quantum optics for the first time

Sajeev Damodarakurup

Experimental suppression of polarization decoherence in a ring cavity uses a simple open-loop control technique known as bang-bang decou-pling. In recent years new strategies for maintaining the coherence (i.e., constant relative phase) of quantum systems have appeared.1, 2 Even if photons interact weakly with their surroundings, the re-sulting decoherence (i.e., randomization of the relative phase) may significantly affect their polarization state during propaga-tion within dispersive media. We show how the polarization de-coherence of a photon circling in a ring cavity can be suppressed by adapting to the field of quantum optics the open-loop pro-tection technique known as bang-bang (BB). This method is al-ready being employed for nuclear spins and nuclear-quadrupole qubits. It has potential practical application in the field of optical fibers.

SPIE Newsroom•Jan 1, 2009•0 citations

Dynamical decoupling schemes for inhibiting decoherence in the propagation ofsingle-photon polarization qubits

Giovanni Di Giuseppe, Marco Lucamarini, Rupesh Kumar +3 more

One of the fundamental limitations to high bit rate, long distance, telecommunication in optical fibers is Polarization Mode Dispersion (PMD). Here we show how one can adapt bang-bang control techniques for suppressing the decoherence of polarization states in optical fibers by carrying out controlled rotations of polarization at predetermined locations along the fiber. We propose an experimental proof-ofprinciple demonstration of the idea based on the propagation of polarization qubits in a ring-cavity containing birefringent crystals and wave-plates.

•Jan 1, 2007•0 citations

Suppression of polarization decoherence for traveling light pulses via bang-bang dynamical decoupling

Marco Lucamarini, Giovanni Di Giuseppe, Sajeev Damodarakurup +2 more

In the propagation of optical pulses through dispersive media, the frequency degree of freedom acts as an effective decohering environment on the polarization state of the pulse. Here we discuss the application of open-loop dynamical-decoupling techniques for suppressing such a polarization decoherence in one-way communication channels. We describe in detail the experimental proof of principle of the ``bang-bang'' protection technique recently applied to flying qubits in Damodarakurup et al. [Phys. Rev. Lett. 103, 040502 (2009)]. Bang-bang operations are implemented through appropriately oriented wave plates and dynamical decoupling is shown to be potentially useful to contrast a generic decoherence acting on polarization qubits propagating in dispersive media like optical fibers.

arXiv:1101.3739•Physical Review A•Mar 30, 2011•20 citations

Open-loop and closed-loop control of flying qubits

Marco Lucamarini, Giovanni Di Giuseppe, David Vitali +1 more

We describe two recent techniques, along with related experiments, to control and reduce the noise affecting a photon polarization qubit. The first is based on the open-loop 'bang–bang' method, where suitably tailored pulses are implemented on the system to prevent polarization decoherence. This requires only passive elements when the physical system is a photon and the operation is performed in space rather than in time. The second technique is based on closed-loop 'asymmetric feedback', where some quantities are measured and used for a real-time correction of the system dynamics. This technique necessarily requires active electronics to work.

Journal of Physics B Atomic Molecular and Optical Physics•Jul 25, 2011•7 citations

Quantum coherence and control in one- and two-photon optical systems

Andrew J. Berglund

We investigate coherence in one- and two-photon optical systems, both theoretically and experimentally. In the first case, we develop the density operator representing a single photon state subjected to a non-dissipative coupling between observed (polarization) and unobserved (frequency) degrees of freedom. We show that an implementation of ``bang-bang'' quantum control protects photon polarization information from certain types of decoherence. In the second case, we investigate the existence of a "decoherence-free" subspace of the Hilbert space of two-photon polarization states under the action of a similar coupling. The density operator representation is developed analytically and solutions are obtained numerically. NOTE: This manuscript is taken from the author's undergraduate thesis (A.B. Dartmouth College, June 2000, advised by Dr. Walter E. Lawrence), under the supervision of Dr. Paul G. Kwiat.

arXiv:quant-ph/0010001•Sep 30, 2000•19 citations
Decoherence may significantly affect the polarization state of optical pulses propagating in dispersive media because of the unavoidable presence of more than a single frequency in the envelope of the pulse. Here we report on the suppression of polarization decoherence in a ring cavity obtained by properly retooling for photonic qubits the "bang-bang" protection technique already employed for nuclear spins and nuclear-quadrupole qubits. Our results show that bang-bang control can be profitably extended to quantum information processes involving flying polarization qubits.
In recent years the interest in the manipulation of quantum systems has furthered new strategies for maintaining their coherence, continuously threatened by unwanted and uncontrollable interactions with the environment. Photons interact weakly with the surroundings. Even so decoherence may significantly affect their polarization state during the propagation within dispersive media because of the unavoidable presence of more than a single frequency in the envelope of the photon pulse. Here we report on a suppression of the polarization decoherence in a ring cavity obtained by properly retooling for the photon qubit the "bang-bang" protection technique already employed for nuclear spins and nuclear-quadrupole qubits. Our results show that bang-bang control can be profitably extended to all quantum information processes involving flying polarization qubits.
Experimental suppression of polarization decoherence in a ring cavity uses a simple open-loop control technique known as bang-bang decou-pling. In recent years new strategies for maintaining the coherence (i.e., constant relative phase) of quantum systems have appeared.1, 2 Even if photons interact weakly with their surroundings, the re-sulting decoherence (i.e., randomization of the relative phase) may significantly affect their polarization state during propaga-tion within dispersive media. We show how the polarization de-coherence of a photon circling in a ring cavity can be suppressed by adapting to the field of quantum optics the open-loop pro-tection technique known as bang-bang (BB). This method is al-ready being employed for nuclear spins and nuclear-quadrupole qubits. It has potential practical application in the field of optical fibers.
One of the fundamental limitations to high bit rate, long distance, telecommunication in optical fibers is Polarization Mode Dispersion (PMD). Here we show how one can adapt bang-bang control techniques for suppressing the decoherence of polarization states in optical fibers by carrying out controlled rotations of polarization at predetermined locations along the fiber. We propose an experimental proof-ofprinciple demonstration of the idea based on the propagation of polarization qubits in a ring-cavity containing birefringent crystals and wave-plates.
In the propagation of optical pulses through dispersive media, the frequency degree of freedom acts as an effective decohering environment on the polarization state of the pulse. Here we discuss the application of open-loop dynamical-decoupling techniques for suppressing such a polarization decoherence in one-way communication channels. We describe in detail the experimental proof of principle of the ``bang-bang'' protection technique recently applied to flying qubits in Damodarakurup et al. [Phys. Rev. Lett. 103, 040502 (2009)]. Bang-bang operations are implemented through appropriately oriented wave plates and dynamical decoupling is shown to be potentially useful to contrast a generic decoherence acting on polarization qubits propagating in dispersive media like optical fibers.
We describe two recent techniques, along with related experiments, to control and reduce the noise affecting a photon polarization qubit. The first is based on the open-loop 'bang–bang' method, where suitably tailored pulses are implemented on the system to prevent polarization decoherence. This requires only passive elements when the physical system is a photon and the operation is performed in space rather than in time. The second technique is based on closed-loop 'asymmetric feedback', where some quantities are measured and used for a real-time correction of the system dynamics. This technique necessarily requires active electronics to work.
We investigate coherence in one- and two-photon optical systems, both theoretically and experimentally. In the first case, we develop the density operator representing a single photon state subjected to a non-dissipative coupling between observed (polarization) and unobserved (frequency) degrees of freedom. We show that an implementation of ``bang-bang'' quantum control protects photon polarization information from certain types of decoherence. In the second case, we investigate the existence of a "decoherence-free" subspace of the Hilbert space of two-photon polarization states under the action of a similar coupling. The density operator representation is developed analytically and solutions are obtained numerically. NOTE: This manuscript is taken from the author's undergraduate thesis (A.B. Dartmouth College, June 2000, advised by Dr. Walter E. Lawrence), under the supervision of Dr. Paul G. Kwiat.