Simple Manipulation of a Microwave Dressed-State Ion Qubit

Webster, S. C.; Weidt, Sebastian; Lake, Kim; McLoughlin, James J.; Hensinger, W. K.

doi:10.1103/physrevlett.111.140501

Cited by 63 publications

(99 citation statements)

References 17 publications

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“…This usually requires stabilization methods to decrease the effect of amplitude noise in the dressing field on the sensitivity [25]. However, it has been recently demonstrated using trapped ions [26][27][28][29] that by using additional atomic levels the effect of noise in the dressing fields can be dramatically reduced, and extensions were proposed in Ref. [30].…”

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confidence: 99%

Ultrasensitive Magnetometer using a Single Atom

et al. 2016

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Precision sensing, and in particular high precision magnetometry, is a central goal of research into quantum technologies. For magnetometers, often trade-offs exist between sensitivity, spatial resolution, and frequency range. The precision, and thus the sensitivity of magnetometry, scales as 1/ √ T 2 with the phase coherence time, T 2 , of the sensing system playing the role of a key determinant. Adapting a dynamical decoupling scheme that allows for extending T 2 by orders of magnitude and merging it with a magnetic sensing protocol, we achieve a measurement sensitivity even for high frequency fields close to the standard quantum limit. Using a single atomic ion as a sensor, we experimentally attain a sensitivity of 4.6 pT / √ Hz for an alternating-current magnetic field near 14 MHz. Based on the principle demonstrated here, this unprecedented sensitivity combined with spatial resolution in the nanometer range and tunability from direct-current to the gigahertz range could be used for magnetic imaging in as of yet inaccessible parameter regimes.Introduction -High precision measurements often have played a pivotal role for new discoveries in physics. Today, detecting electromagnetic fields with extreme sensitivity and spatial resolution is particularly important in condensed matter physics and in biochemical sciences. State-of-theart magnetometers reach their best sensitivity in a limited frequency band or do not work at all (for all practical purposes) outside a certain frequency range. They often require a cryogenic and/or a carefully shielded environment. Also, their limited spatial resolution often makes them unsuitable for the applications mentioned above. Here, we introduce and demonstrate a novel method for sensing magnetic fields at the standard quantum limit, based on the use of a single atom as a sensor that is confined to a nanometer-sized region in space. The sensor can be tuned to a desired frequency where a signal shall be measured and is not affected by magnetic disturbances. Also, the magnetometer is essentially immune against amplitude fluctuations of the microwave fields that decouple the sensor from environmental disturbances.Before introducing this novel magnetometer scheme and describing the experimental procedure, we briefly outline state-of-the-art magnetometry by means of a few examples. Magnetic field sensitivities in the range of femto-or even subfemtotesla

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confidence: 99%

Ultrasensitive Magnetometer using a Single Atom

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“…This coupling requires a transition which is very sensitive to a magnetic field to be realized, which can result in low decoherence times due to environmental fluctuations in the field. By dressing the ion with microwave fields, the decoherence time of the qubit can be massively increased, while still retaining the coupling due to the field gradient [18,22]. This will allow multiqubit quantum gates to be realized using microwave fields.…”

Section: Discussionmentioning

confidence: 99%

“…Both ions are prepared in F = 0, and after the application of microwave radiation equivalent to a π pulse it is determined if an ion has transitioned to F = 1. A description of the methods used for preparation and measurement of the hyperfine state is given in [22]. Figure 3 shows the resultant probability of at least one ion being transferred to F = 1 as a function of the frequency of the microwave pulse; the two peaks separated by ω = 2π × 2.71 MHz correspond to the two different transition frequencies of the different ions.…”

Section: Creating a Large Magnetic-field Gradientmentioning

confidence: 99%

Generation of spin-motion entanglement in a trapped ion using long-wavelength radiation

et al. 2015

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(2015) Generation of spin-motion entanglement in a trapped ion using long-wavelength radiation. Physical Review A, 91 (1). 0123191-0123195. ISSN 10500123191-0123195. ISSN -2947 This version is available from Sussex Research Online: http://sro.sussex.ac.uk/52413/ This document is made available in accordance with publisher policies and may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the URL above for details on accessing the published version. Copyright and reuse:Sussex Research Online is a digital repository of the research output of the University.Copyright and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable, the material made available in SRO has been checked for eligibility before being made available.Copies of full text items generally can be reproduced, displayed or performed and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way.PHYSICAL REVIEW A 91, 012319 (2015) Generation of spin-motion entanglement in a trapped ion using long-wavelength radiation Applying a magnetic-field gradient to a trapped ion allows long-wavelength radiation to produce a mechanical force on the ion's motion when internal transitions are driven. We demonstrate such a coupling using a single trapped 171 Yb + ion and use it to produce entanglement between the spin and motional state, an essential step toward using such a field gradient to implement multiqubit operations.

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“…Since we are operating with a rotated basis F z = cos θ F z + sin θ F α , we can initialize the system in a tensor product of |0 in the F z basis using polarization [50,51]. Then we can rotate the state with orthogonal operations: F β (with α ⊥ β ), similarly to what was described above.…”

Section: Adiabatic Quantum Simulationmentioning

confidence: 99%

“…For our derivation, we consider the hyperfine structure of the 171 Yb + ion ( fig. 2), with microwave energy separation between the singlet and the three triplet states [50,51]. Removing the m F = 0 state (|0 ) from the triplet, we are left with three energy levels for modeling the simulated spin-one system.…”

Section: Modelmentioning

confidence: 99%

Simulating the Haldane phase in trapped-ion spins using optical fields

et al. 2015

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We propose to experimentally explore the Haldane phase in spin-one XXZ antiferromagnetic chains using trapped ions. We show how to adiabatically prepare the ground states of the Haldane phase, demonstrate their robustness against sources of experimental noise, and propose ways to detect the Haldane ground states based on their excitation gap and exponentially decaying correlations, nonvanishing nonlocal string order, and doublydegenerate entanglement spectrum.

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Simple Manipulation of a Microwave Dressed-State Ion Qubit

Cited by 63 publications

References 17 publications

Ultrasensitive Magnetometer using a Single Atom

Ultrasensitive Magnetometer using a Single Atom

Generation of spin-motion entanglement in a trapped ion using long-wavelength radiation

Simulating the Haldane phase in trapped-ion spins using optical fields

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