Sensitivity Enhancement by Matched Microwave Pulses in One- and Two-Dimensional Electron Spin Echo Envelope Modulation Spectroscopy

Jeschke, Gunnar; Rakhmatullin, R. M.; Schweiger, Arthur

doi:10.1006/jmre.1998.1367

Cited by 75 publications

(90 citation statements)

References 24 publications

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“…Note that a small amount of 12 MHz modulation due to the 1 H transitions in the spinup manifold is present in the 22 MHz transition data, both in simulation and experiment. We emphasize that we have not been able to reproduce the 22 MHz and 52 MHz frequencies in any type of standard ESEEM experiment, including 'matched' ESEEM [21] with soft pulses designed to favor excitation of those coherences.…”

Section: Methodsmentioning

confidence: 98%

Coherent Control of Two Nuclear Spins Using the Anisotropic Hyperfine Interaction

et al. 2011

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We demonstrate coherent control of two nuclear spins mediated by the magnetic resonance of a hyperfine-coupled electron spin. This control is used to create a double nuclear coherence in one of the two electron spin manifolds, starting from an initial thermal state, in direct analogy to the creation of an entangled (Bell) state from an initially pure unentangled state. We identify challenges and potential solutions to obtaining experimental gate fidelities useful for quantum information processing in this type of system.

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Section: Methodsmentioning

confidence: 98%

Coherent Control of Two Nuclear Spins Using the Anisotropic Hyperfine Interaction

et al. 2011

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“…Note that a small amount of 12 MHz modulation due to the 1 H transitions in the spin-up manifold is present in the 22 MHz transition data, both in simulation and experiment. We emphasize that we have not been able to reproduce the 22 and 52 MHz frequencies in any type of standard ESEEM experiment, including ''matched'' ESEEM [23] with soft pulses designed to favor excitation of those coherences.…”

Section: Prl 107 170503 (2011) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Nuclear Spins Tango to the Tune of an Electron

Hu¹

2011

Physics

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We demonstrate coherent control of two nuclear spins mediated by the magnetic resonance of a hyperfine-coupled electron spin. This control is used to create a double-nuclear coherence in one of the two electron spin manifolds, starting from an initial thermal state, in direct analogy to the creation of an entangled (Bell) state from an initially pure unentangled state. We identify challenges and potential solutions to obtaining experimental gate fidelities useful for quantum information processing in this type of system. Introduction.-Solid-state spin systems are interesting candidates for quantum information processing: the small systems explored in the lab today are excellent test beds for the ideas of quantum control and quantum error correction, and it may be possible to reach enough qubits for nontrivial quantum computations or to integrate these systems into useful hybrid devices for quantum communications [1] or quantum sensors [2]. The past two decades have seen much progress in the high-fidelity control of small quantum processors realized by nuclear magnetic resonance [3,4], electron spin resonance (ESR) [5][6][7][8][9], and electron-nuclear double resonance [10][11][12][13]. These experiments have served as benchmarks for experimentally attainable gate fidelities [14] and have spurred the development of robust quantum control methods [15,16]. Hybrid electron-nuclear spin systems make it possible to exploit the strengths of each type of spin: electron spin for initialization, readout, and control and nuclear spin for long storage and coherence times [12,13,17]. In particular, it is advantageous to use the electron spin as an actuator to gain full control of the system's spin dynamics via the anisotropic part of the hyperfine interaction [5,18]. Since the hyperfine interaction to nearby nuclei can be of order 1-100 MHz, fast electron-nuclear and nuclear-nuclear gates can be realized by this approach. Several prior studies have demonstrated coherent control of a one electron þ one nuclear spin system using a modulated microwave field in concert with anisotropic coupling [5,7,8]. In this work, we demonstrate an entangling gate between two nuclear spins fully mediated by control of the electron spin. This is an important first step towards achieving efficient control of hybrid electron-nuclear spin systems of interest for quantum information processing.Experiment.-The spin system employed here is based on the stable radical of malonic acid in the solid state [5,7,8,10] with an additional 13 C labeling. X-ray irradiation removes a proton from the methylene group, leaving

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“…These double-quantum peaks usually do not show up in standard HYSCORE spectra, but are readily observable with the matched HYSCORE technique. [28] To assign the two experimentally observed species we have thus performed HYSCORE and matched HYSCORE experiments under conditions where either species I dominates (observer field A in Figure 1 a) or species II (observer field B) contributes somewhat more strongly (56 % of the total signal intensity).…”

Section: Assignment Of the Copper Speciesmentioning

confidence: 99%

“…The spectrum is characterized by a broad ridge close to the antidiagonal at the proton Zeeman frequency ( Figure 5 a) and a broad ridge close to the antidiagonal at two times the proton Zeeman frequency (Figure 5 b). The presence of a signal near 2n 1H , stemming from a double-quantum nuclear coherence, [28] indicates that there are at least two non-exchangeable protons with moderate couplings to the copper center. As the double-quantum ridge is by about 1 MHz broader than the single-quantum ridge, it cannot be explained by weakly coupled remote protons.…”

Section: Assignment Of the Copper Speciesmentioning

confidence: 99%

Can Copper(II) Mediate Hoogsteen Base‐Pairing in a Left‐Handed DNA Duplex? A Pulse EPR Study

et al. 2010

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Pulse EPR spectroscopy is used to investigate possible structural features of the copper(II) ion coordinated to poly(dG-dC).poly(dG-dC) in a frozen aqueous solution, and the structural changes of the polynucleotide induced by the presence of the metal ion. Two different copper species were identified and their geometry explained by a molecular model. According to this model, one species is exclusively coordinated to a single guanine with the N7 nitrogen atom forming a coordinative bond with the copper. In the other species, a guanine and a cytosine form a ternary complex together with the copper ion. A copper crosslink between the N7 of guanine and N3 of cytosine is proposed as the most probable coordination site. Moreover, no evidence was found for an interaction of either copper species with a phosphate group or equatorial water molecules. In addition, circular dichroism (CD) spectroscopy showed that the DNA of the Cu(II)-poly(dG-dC).poly(dG-dC) adducts resembles the left-handed Z-form. These results suggest that metal-mediated Hoogsteen base pairing, as previously proposed for a right-handed DNA duplex, can also occur in a double-stranded left-handed DNA.

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Sensitivity Enhancement by Matched Microwave Pulses in One- and Two-Dimensional Electron Spin Echo Envelope Modulation Spectroscopy

Cited by 75 publications

References 24 publications

Coherent Control of Two Nuclear Spins Using the Anisotropic Hyperfine Interaction

Coherent Control of Two Nuclear Spins Using the Anisotropic Hyperfine Interaction

Nuclear Spins Tango to the Tune of an Electron

Can Copper(II) Mediate Hoogsteen Base‐Pairing in a Left‐Handed DNA Duplex? A Pulse EPR Study

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