Electrons in a cryogenic planar Penning trap and experimental challenges for quantum processing

Bushev, Pavel; Ståhl, S.; Natali, Riccardo; Marx, G.; Stachowska, E.; Werth, G.; Hellwig, M.; Schmidt‐Kaler, F.

doi:10.1140/epjd/e2008-00186-y

Cited by 40 publications

(51 citation statements)

References 14 publications

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“…[13] says that a still broader width of 3 MHz "is expected and is in agreement with the measured data." Why this particular width should be expected is not specified.…”

Section: Acknowledgmentssupporting

confidence: 75%

“…To be avoided is the shaded area near the diagonal boundaryρ2 =ρ3 where there is a rather strong and sensitive cancelation between the effect of the potentials V2 and V3. No optimized traps are possible in the unshaded region, with the the earlier traps (crosses) at Mainz [11] and Ulm [13] as examples.…”

Section: Previous Three-gap Trapsmentioning

confidence: 99%

“…These observations made possible the most precise measurements of the electron magnetic moment and the fine structure constant [2]. The one-electron observations also triggered intriguing studies on using oneelectron qubits as building blocks for quantum information processing [3][4][5][6][7][8][9][10][11][12][13][14]. The possibility of a very long coherence time is very attractive.…”

Section: Introductionmentioning

confidence: 99%

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Optimized planar Penning traps for quantum information studies

Goldman¹,

Gabrielse²

2011

TCP 2010

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A one-electron qubit would offer a new option for quantum information science, including the possibility of extremely long coherence times. One-quantum cyclotron transitions and spin flips have been observed for a single electron in a cylindrical Penning trap. However, an electron suspended in a planar Penning trap is a more promising building block for the array of coupled qubits needed for quantum information studies. The optimized design configurations identified here promise to make it possible to realize the elusive goal of one trapped electron in a planar Penning trap for the first time -a substantial step toward a one-electron qubit.

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“…[13] says that a still broader width of 3 MHz "is expected and is in agreement with the measured data." Why this particular width should be expected is not specified.…”

Section: Acknowledgmentssupporting

confidence: 75%

Section: Previous Three-gap Trapsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimized planar Penning traps for quantum information studies

Goldman¹,

Gabrielse²

2011

TCP 2010

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“…for the trapping of ultracold atom clouds on a chip [18] or electrons in planar Penning traps [19]. We use strategically placed micropatterned holes (antidots) in the superconducting film to provide well-known and highly controllable pinning sites for Abrikosov vortices [20][21][22].…”

mentioning

confidence: 99%

Improving the performance of superconducting microwave resonators in magnetic fields

Bothner¹,

Gaber²,

Kemmler³

et al. 2011

Appl. Phys. Lett.

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The operation of superconducting coplanar waveguide cavities, as used for circuit quantum electrodynamics and kinetic inductance detectors, in perpendicular magnetic fields normally leads to a reduction of the device performance due to energy dissipating Abrikosov vortices. We experimentally investigate the vortex induced energy losses in such Nb resonators with different spatial distributions of micropatterned pinning sites (antidots) by transmission spectroscopy measurements at 4.2 K. In comparison to resonators without antidots we find a significant reduction of vortex induced losses and thus increased quality factors over a broad range of frequencies and applied powers in moderate fields.

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“…Moreover, new pixel microstructures promise to generate complex electric potentials, suitable both for particle transport and trapping in racetrack and artificial crystal configurations [8]. The first planar Penning traps were operated in Mainz [9,10] and in Ulm [11] both at room temperature and in a cryogenic environment. However, the elusive goal of a single trapped electron has not yet been achieved.…”

mentioning

confidence: 99%

From a single- to a double-well Penning trap

2010

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The new generation of planar Penning traps promises to be a flexible and versatile tool for quantum information studies. Here, we propose a fully controllable and reversible way to change the typical trapping harmonic potential into a double-well potential, in the axial direction. In this configuration a trapped particle can perform coherent oscillations between the two wells. The tunneling rate, which depends on the barrier height and width, can be adjusted at will by varying the potential difference applied to the trap electrodes. Most notably, tunneling rates in the range of kHz are achievable even with a trap size of the order of 100 µm.The challenging goal of using single electrons in Penning traps for quantum information [1-6] has motivated intense research towards a completely new generation of devices. The so-called planar Penning traps [7] are specifically designed to meet the demands of quantum computation, thus allowing for scalability as well as improved addressability of the trapped particles. Moreover, new pixel microstructures promise to generate complex electric potentials, suitable both for particle transport and trapping in racetrack and artificial crystal configurations [8]. The first planar Penning traps were operated in Mainz [9, 10] and in Ulm [11] both at room temperature and in a cryogenic environment. However, the elusive goal of a single trapped electron has not yet been achieved. The major obstacle is the anharmonicity in the axial potential, which prevents the detection of a single electron. To overcome this difficulty new theoretical studies [12] have carefully analyzed the geometry of planar Penning traps, with the aim of optimizing the harmonicity of the axial potential. The results are extremely encouraging and may lead to the first experimental demonstration of a single electron in a planar Penning trap.Here we demonstrate the versatility of a planar Penning trap. In fact, it is able to produce a smooth variation of the trapping axial potential from a standard harmonic well into a double well. This result is achieved by applying suitable static voltages to the trap electrodes. The experimenter can control both the barrier height and width, simply by adjusting the potential difference between the electrodes. In particular, we have simulated the behavior of an optimized mirror-image planar Penning trap, which consists of two identical sets of electrodes facing each other. An electron, initially trapped in a singlewell harmonic potential, can be adiabatically placed in a double-well potential. Depending on the energy of the axial motion, the particle wave function may spread over for several microns, through the barrier between the two wells. Therefore, the particle motional state could be prepared in a superposition of left and right, with the particle being, at the same time, in both wells. Hence, if a single electron trapped in a Penning trap forms a socalled geonium atom [13], the electron in the double-well potential can mimic a giant molecule along the lines of Ref. [14]. More...

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Electrons in a cryogenic planar Penning trap and experimental challenges for quantum processing

Cited by 40 publications

References 14 publications

Optimized planar Penning traps for quantum information studies

Optimized planar Penning traps for quantum information studies

Improving the performance of superconducting microwave resonators in magnetic fields

From a single- to a double-well Penning trap

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