Coherent spin manipulation in an exchange-only qubit

Laird, E.; Taylor, Jacob M.; DiVincenzo, David P.; Marcus, C. M.; Hanson, M.; Gossard, A. C.

doi:10.1103/physrevb.82.075403

Cited by 238 publications

(311 citation statements)

References 23 publications

Supporting

Mentioning

306

Contrasting

Unclassified

Order By: Relevance

“…The name was coined by Kastner et al [20] after the discovery of quantized electronic levels inside the QDs. The amount of experiments performed in QDs and the variety of phenomena with a straight correlation to those found in atoms increased enormously over the years [21][22][23][24][25][26][27][28][29] and was mainly motivated by the vast range of technological applications of QDs as 07002-p.4…”

Section: Icec In Quantum Dotsmentioning

confidence: 99%

Interatomic Coulombic electron capture in atomic, molecular, and quantum dot systems

Bande

Pont

Gokhberg

et al. 2015

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. The interatomic Coulombic electron capture (ICEC) process has recently been predicted theoretically for clusters of atoms and molecules. For an atom A capturing an electron e( ) it competes with the well known photorecombination, because in an environment of neutral or anionic neighboring atoms B, A can transfer its excess energy in the ultrafast ICEC process to B which is then ionized. The cross section for e( ) + A + B → A − + B + + e( ) has been obtained in an asymptotic approximation based on scattering theory for several clusters [1,2]. It was found that ICEC starts dominating the PR for distances among participating species of nanometers and lower. Therefore, we believe that the ICEC process might be of importance in the atmosphere, in biological systems, plasmas, or in nanostructured materials. As an example for the latter, ICEC has been investigated by means of electron dynamics in a model potential for semiconductor double quantum dots (QDs) [3]. In the simplest case one QD captures an electron while the outgoing electron is emitted from the other. The reaction probability for this process was found to be relatively large.

show abstract

Section: Icec In Quantum Dotsmentioning

confidence: 99%

Interatomic Coulombic electron capture in atomic, molecular, and quantum dot systems

Bande

Pont

Gokhberg

et al. 2015

EPJ Web of Conferences

View full text Add to dashboard Cite

show abstract

“…Three coherently coupled quantum dots with three spins attracted interest in the hope to construct a qubit using purely electrically gated manipulations [9,10]. Most recently, for a triple quantum dot (TQD) structure it was shown that bipolar spin blockade can become a relevant quantum coherent mechanism [11].…”

Section: Introductionmentioning

confidence: 99%

Entanglement switching via the Kondo effect in triple quantum dots

et al. 2014

View full text Add to dashboard Cite

Abstract. We consider a triple quantum dot system in a triangular geometry with one of the dots connected to metallic leads. Using Wilson's numerical renormalization group method, we investigate quantum entanglement and its relation to the thermodynamic and transport properties in the regime where each of the dots is singly occupied on average, but with non-negligible charge fluctuations. It is shown that even in the regime of significant charge fluctuations the formation of the Kondo singlets induces switching between separable and perfectly entangled states. The quantum phase transition between unentangled and entangled states is analyzed quantitatively and the corresponding phase diagram is explained by exactly solvable spin model. In the framework of an effective model we also explain smearing of the entanglement transition for cases when the symmetry of the triple quantum dot system is relaxed.

show abstract

“…Here we examine the validity range of the Gaussian approximation, as the number of fluctuators is increased, and its dependence on the number of control pulses. As current experimental efforts are focused on more complicated QD structures, such as two coupled double QDs, 26,35 and three-spin qubits in triple-dots, [36][37][38] the resulting larger devices are expected to have a noisier charge environment. Understanding how qubit decoherence scales with the number of TLFs is therefore important.…”

Section: Introductionmentioning

confidence: 99%

Non-Gaussian signatures and collective effects in charge noise affecting a dynamically decoupled qubit

Ramon

2015

Phys. Rev. B

View full text Add to dashboard Cite

The effects of a collection of classical two-level charge fluctuators on the coherence of a dynamicallydecoupled qubit are studied. Distinct dynamics are found at different qubit working positions. Exact analytical formulae are derived at pure dephasing and approximate solutions are found at the general working position, for weakly-and strongly-coupled fluctuators. Analysis of these solutions, combined with numerical simulations of the multiple random telegraph processes, reveal the scaling of the noise with the number of fluctuators and the number of control pulses, as well as dependence on other parameters of the qubit-fluctuators system. These results can be used to determine potential microscopic models for the charge environment by performing noise spectroscopy.

show abstract

Coherent spin manipulation in an exchange-only qubit

Cited by 238 publications

References 23 publications

Interatomic Coulombic electron capture in atomic, molecular, and quantum dot systems

Interatomic Coulombic electron capture in atomic, molecular, and quantum dot systems

Entanglement switching via the Kondo effect in triple quantum dots

Non-Gaussian signatures and collective effects in charge noise affecting a dynamically decoupled qubit

Contact Info

Product

Resources

About