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  1. Article ; Online: Optimal Sensing Protocol for Statistically Polarized Nano-NMR with NV Centers.

    Staudenmaier, Nicolas / Vijayakumar-Sreeja, Anjusha / Genov, Genko / Cohen, Daniel / Findler, Christoph / Lang, Johannes / Retzker, Alex / Jelezko, Fedor / Oviedo-Casado, Santiago

    Physical review letters

    2023  Volume 131, Issue 15, Page(s) 150801

    Abstract: Diffusion noise represents a major constraint to successful liquid state nano-NMR spectroscopy. Using the Fisher information as a faithful measure, we theoretically calculate and experimentally show that phase sensitive protocols are superior in most ... ...

    Abstract Diffusion noise represents a major constraint to successful liquid state nano-NMR spectroscopy. Using the Fisher information as a faithful measure, we theoretically calculate and experimentally show that phase sensitive protocols are superior in most experimental scenarios, as they maximize information extraction from correlations in the sample. We derive the optimal experimental parameters for quantum heterodyne detection (Qdyne) and present the most accurate statistically polarized nano-NMR Qdyne detection experiments to date, leading the way to resolve chemical shifts and J couplings at the nanoscale.
    Language English
    Publishing date 2023-10-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.131.150801
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  2. Article ; Online: Magnetic pulses enable multidimensional optical spectroscopy of dark states.

    Oviedo-Casado, Santiago / Šanda, František / Hauer, Jürgen / Prior, Javier

    The Journal of chemical physics

    2020  Volume 152, Issue 8, Page(s) 84201

    Abstract: The study and manipulation of low dipole moment quantum states have been challenging due to their inaccessibility by conventional spectroscopic techniques. Controlling the spin in such states requires unfeasible strong magnetic fields to overcome typical ...

    Abstract The study and manipulation of low dipole moment quantum states have been challenging due to their inaccessibility by conventional spectroscopic techniques. Controlling the spin in such states requires unfeasible strong magnetic fields to overcome typical decoherence rates. However, the advent of terahertz technology and its application in magnetic pulses opens up a new scenario. In this article, we focus on an electron-hole pair model to demonstrate that it is possible to control the precession of the spins and to modify the transition rates to different spin states. Enhancing transitions from a bright state to a dark state with different spins means that the latter can be revealed by ordinary spectroscopy. We propose a modification of the standard two-dimensional spectroscopic scheme in which a three pulse sequence is encased in a magnetic pulse. Its role is to drive transitions between a bright and a dark spin state, making the latter susceptible to spectroscopic investigation.
    Language English
    Publishing date 2020-02-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/1.5139409
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  3. Article ; Online: Publisher Correction: Magnetic field enhancement of organic photovoltaic cells performance.

    Oviedo-Casado, S / Urbina, A / Prior, J

    Scientific reports

    2018  Volume 8, Issue 1, Page(s) 4676

    Abstract: A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper. ...

    Abstract A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
    Language English
    Publishing date 2018-03-13
    Publishing country England
    Document type Published Erratum
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-018-21980-z
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  4. Article ; Online: Magnetic field enhancement of organic photovoltaic cells performance.

    Oviedo-Casado, S / Urbina, A / Prior, J

    Scientific reports

    2017  Volume 7, Issue 1, Page(s) 4297

    Abstract: Charge separation is a critical process for achieving high efficiencies in organic photovoltaic cells. The initial tightly bound excitonic electron-hole pair has to dissociate fast enough in order to avoid photocurrent generation and thus power ... ...

    Abstract Charge separation is a critical process for achieving high efficiencies in organic photovoltaic cells. The initial tightly bound excitonic electron-hole pair has to dissociate fast enough in order to avoid photocurrent generation and thus power conversion efficiency loss via geminate recombination. Such process takes place assisted by transitional states that lie between the initial exciton and the free charge state. Due to spin conservation rules these intermediate charge transfer states typically have singlet character. Here we propose a donor-acceptor model for a generic organic photovoltaic cell in which the process of charge separation is modulated by a magnetic field which tunes the energy levels. The impact of a magnetic field is to intensify the generation of charge transfer states with triplet character via inter-system crossing. As the ground state of the system has singlet character, triplet states are recombination-protected, thus leading to a higher probability of successful charge separation. Using the open quantum systems formalism we demonstrate that the population of triplet charge transfer states grows in the presence of a magnetic field, and discuss the impact on carrier population and hence photocurrent, highlighting its potential as a tool for research on charge transfer kinetics in this complex systems.
    Language English
    Publishing date 2017-06-27
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-017-04621-9
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  5. Article ; Online: Correlated noise in Brownian motion allows for super resolution.

    Oviedo-Casado, Santiago / Rotem, Amit / Nigmatullin, Ramil / Prior, Javier / Retzker, Alex

    Scientific reports

    2020  Volume 10, Issue 1, Page(s) 19691

    Abstract: ... theoretical evidence that predicts a power law decay of the signal's correlations due to diffusion noise ...

    Abstract Diffusion broadening of spectral lines is the main limitation to frequency resolution in non-polarized liquid state nano-NMR. This problem arises from the limited amount of information that can be extracted from the signal before losing coherence. For liquid state NMR as with most generic sensing experiments, the signal is thought to decay exponentially, severely limiting resolution. However, there is theoretical evidence that predicts a power law decay of the signal's correlations due to diffusion noise in the non-polarized nano-NMR scenario. In this work we show that in the NV based nano-NMR setup such diffusion noise results in high spectral resolution.
    Language English
    Publishing date 2020-11-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-020-76745-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Book ; Online: Magnetic pulses enable multidimensional optical spectroscopy of dark states

    Oviedo-Casado, Santiago / Šanda, František / Hauer, Jürgen / Prior, Javier

    2019  

    Abstract: The study and manipulation of low dipole moment quantum states has been challenging due to their inaccessibility by conventional spectroscopic techniques. Controlling the spin in such states requires unfeasible strong magnetic fields to overcome typical ... ...

    Abstract The study and manipulation of low dipole moment quantum states has been challenging due to their inaccessibility by conventional spectroscopic techniques. Controlling the spin in such states requires unfeasible strong magnetic fields to overcome typical decoherence rates. However, the advent of terahertz technology and its application to magnetic pulses opens up a new scenario. In this article, we focus on an electron-hole pair model to demonstrate that it is possible to control the precession of the spins and to modify the transition rates to different spin states. Enhancing transitions from a bright state to a dark state with different spin means that the latter can be revealed by ordinary spectroscopy. We propose a modification of the standard two-dimensional spectroscopic scheme in which a three pulse sequence is encased in a magnetic pulse. Its role is to drive transitions between a bright and a dark spin state, making the latter susceptible to spectroscopic investigation.

    Comment: 9 pages, 5 figures. Matches journal version. Comments welcome
    Keywords Quantum Physics ; Condensed Matter - Materials Science ; Physics - Chemical Physics
    Subject code 530
    Publishing date 2019-01-01
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  7. Article ; Online: Magnetic field enhancement of organic photovoltaic cells performance

    S. Oviedo-Casado / A. Urbina / J. Prior

    Scientific Reports, Vol 7, Iss 1, Pp 1-

    2017  Volume 9

    Abstract: Abstract Charge separation is a critical process for achieving high efficiencies in organic photovoltaic cells. The initial tightly bound excitonic electron-hole pair has to dissociate fast enough in order to avoid photocurrent generation and thus power ... ...

    Abstract Abstract Charge separation is a critical process for achieving high efficiencies in organic photovoltaic cells. The initial tightly bound excitonic electron-hole pair has to dissociate fast enough in order to avoid photocurrent generation and thus power conversion efficiency loss via geminate recombination. Such process takes place assisted by transitional states that lie between the initial exciton and the free charge state. Due to spin conservation rules these intermediate charge transfer states typically have singlet character. Here we propose a donor-acceptor model for a generic organic photovoltaic cell in which the process of charge separation is modulated by a magnetic field which tunes the energy levels. The impact of a magnetic field is to intensify the generation of charge transfer states with triplet character via inter-system crossing. As the ground state of the system has singlet character, triplet states are recombination-protected, thus leading to a higher probability of successful charge separation. Using the open quantum systems formalism we demonstrate that the population of triplet charge transfer states grows in the presence of a magnetic field, and discuss the impact on carrier population and hence photocurrent, highlighting its potential as a tool for research on charge transfer kinetics in this complex systems.
    Keywords Medicine ; R ; Science ; Q
    Subject code 530
    Language English
    Publishing date 2017-06-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Correlated noise in Brownian motion allows for super resolution

    Santiago Oviedo-Casado / Amit Rotem / Ramil Nigmatullin / Javier Prior / Alex Retzker

    Scientific Reports, Vol 10, Iss 1, Pp 1-

    2020  Volume 9

    Abstract: ... However, there is theoretical evidence that predicts a power law decay of the signal’s correlations due ...

    Abstract Abstract Diffusion broadening of spectral lines is the main limitation to frequency resolution in non-polarized liquid state nano-NMR. This problem arises from the limited amount of information that can be extracted from the signal before losing coherence. For liquid state NMR as with most generic sensing experiments, the signal is thought to decay exponentially, severely limiting resolution. However, there is theoretical evidence that predicts a power law decay of the signal’s correlations due to diffusion noise in the non-polarized nano-NMR scenario. In this work we show that in the NV based nano-NMR setup such diffusion noise results in high spectral resolution.
    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2020-11-01T00:00:00Z
    Publisher Nature Publishing Group
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  9. Article ; Online: Limits on Spectral Resolution Measurements by Quantum Probes.

    Rotem, Amit / Gefen, Tuvia / Oviedo-Casado, Santiago / Prior, Javier / Schmitt, Simon / Burak, Yoram / McGuiness, Liam / Jelezko, Fedor / Retzker, Alex

    Physical review letters

    2019  Volume 122, Issue 6, Page(s) 60503

    Abstract: The limits of frequency resolution in nano-NMR experiments have been discussed extensively in recent years. It is believed that there is a crucial difference between the ability to resolve a few frequencies and the precision of estimating a single one. ... ...

    Abstract The limits of frequency resolution in nano-NMR experiments have been discussed extensively in recent years. It is believed that there is a crucial difference between the ability to resolve a few frequencies and the precision of estimating a single one. Whereas the efficiency of single frequency estimation gradually increases with the square root of the number of measurements, the ability to resolve two frequencies is limited by the specific timescale of the signal and cannot be compensated for by extra measurements. Here we show theoretically and demonstrate experimentally that the relationship between these quantities is more subtle and both are only limited by the Cramér-Rao bound of a single frequency estimation.
    Language English
    Publishing date 2019-03-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.122.060503
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  10. Article ; Online: Low Field Nano-NMR via Three-Level System Control.

    Cerrillo, J / Oviedo Casado, S / Prior, J

    Physical review letters

    2021  Volume 126, Issue 22, Page(s) 220402

    Abstract: Conventional control strategies for nitrogen-vacancy centers in quantum sensing are based on a two-level model of their triplet ground state. However, this approach fails in regimes of weak bias magnetic fields or strong microwave pulses, as we ... ...

    Abstract Conventional control strategies for nitrogen-vacancy centers in quantum sensing are based on a two-level model of their triplet ground state. However, this approach fails in regimes of weak bias magnetic fields or strong microwave pulses, as we demonstrate. To overcome this limitation, we propose a novel control sequence that exploits all three levels by addressing a hidden Raman configuration with microwave pulses tuned to the zero-field transition. We report excellent performance in typical dynamical decoupling sequences, opening up the possibility for nano-NMR operation in low field environments.
    Language English
    Publishing date 2021-06-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.126.220402
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