Highly sensitive and broadband carbon nanotube radio-frequency single-electron transistor

Andresen, S. E.; Wu, Fan; Danneau, R.; Gunnarsson, David; Hakonen, Pertti

doi:10.1063/1.2968123

Cited by 21 publications

(14 citation statements)

References 29 publications

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“…2 5͔͒ for our double gate device which corresponds to an rms charge resolution of 0.4 electron in the 0.8 GHz bandwidth of our setup. Within a factor five of the best resolution achieved in SETs, 2 this smaller sensitivity of the present CNT-FETs is balanced by a much larger bandwidth ͑0.8 GHz here against 0.08 GHz in Ref. 2͒ and the possibility to operate at room temperature.…”

mentioning

confidence: 80%

Thermal shot noise in top-gated single carbon nanotube field effect transistors

Chaste¹,

Pallecchi²,

Morfin³

et al. 2010

Applied Physics Letters

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mentioning

confidence: 80%

Thermal shot noise in top-gated single carbon nanotube field effect transistors

Chaste¹,

Pallecchi²,

Morfin³

et al. 2010

Applied Physics Letters

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“…However, it should be feasible to engineer much stronger couplings in nanowire or nanotube devices where there is already natural confinement in an additional dimension. In the case of nanotube devices where the leads can dominate the capacitance [25], we expect that the coupling could be made κ 0.5. In summary, we have demonstrated state detection for a semiconductor double quantum dot device using a resonant circuit.…”

Section: Pacs Numbersmentioning

confidence: 99%

Charge and Spin State Readout of a Double Quantum Dot Coupled to a Resonator

et al. 2010

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State readout is a key requirement for a quantum computer. For semiconductor-based qubit devices it is usually accomplished using a separate mesoscopic electrometer. Here we demonstrate a simple detection scheme in which a radio-frequency resonant circuit coupled to a semiconductor double quantum dot is used to probe its charge and spin states. These results demonstrate a new non-invasive technique for measuring charge and spin states in quantum dot systems without requiring a separate mesoscopic detector. PACS numbers:State readout is a key requirement for a quantum information processor. For semiconductor-based qubit devices this is usually accomplished using a separate mesoscopic electrometer such as a quantum point contact (QPC) [1]. Non-invasive detection using a QPC has been critical to recent advances in coherent control of few-electron double quantum dots [2], allowing their charge configurations to be mapped in regimes where transport through the double dot itself is not measurable [3]. Furthermore, through spin-to-charge conversion techniques, spin state measurements of single and double dots have been demonstrated using QPCs [4,5].Resonant microwave circuits have played an important role in performing sensitive measurements of mesoscopic devices. In the case of superconducting charge qubits, earlier schemes used a proximal single electron transistor (SET) charge detector to perform state readout [6,7]. This SET was coupled to an impedance matching rf resonant circuit to form an rf-SET which had dramatically improved sensitivity and bandwidth [8]. Similarly, an rf-QPC has also been realised for broadband charge detection of semiconductor quantum dot devices [9,10].More recently, state readout of a superconducting charge qubit has been accomplished by directly coupling it to a microwave resonant circuit [11][12][13]. Working in the dispersive regime where the resonator and qubit bandgap energies are detuned, the qubit has a state-dependent 'quantum capacitance' which causes a shift in the resonator frequency [14]. This frequency shift can then be detected using standard homodyne detection techniques.In this Letter, we demonstrate dispersive detection using a resonant circuit coupled directly to an AlGaAs/GaAs few-electron double quantum dot device. This allows us to probe the charge state of a single electron confined to a double quantum dot. We also perform a spin-state measurement for a pair of electrons using the resonant circuit. These results demonstrate a new and non-invasive technique for measuring charge and spin states in semiconductor quantum dot systems without the need for a separate mesoscopic detector.In using the resonator to probe the state of a double quantum dot we consider the double dot as a charge qubit where a single electron occupies either the ground state of one dot or the other [16]. The Hamiltonian for this two level system is given by H = 1 2 σ z + tσ x , where is the detuning between the two dot chemical potential energies and t is the interdot tunnel coupling energy which m...

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“…where BW =10 5 Hz is the resolution bandwidth of the measurement, and the factor ͱ 2 accounts for the fact that there are two side peaks. 9 Even though our result falls short of the best nanotube 8 and nanowire 13 results, it beats the recently obtained rf-SET sensitivities in silicon devices. 14,15 Figure 2͑b͒ also displays clear SNR peaks off zero bias indicating that our device can also work well under finitebias conditions.…”

Section: Methodsmentioning

confidence: 50%

rf-electrometer using a carbon nanotube resonant tunneling transistor

Lechner¹,

Wu²,

Danneau³

et al. 2010

Journal of Applied Physics

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We have studied resonant tunneling transistors (RTT) made of single-walled carbon nanotube quantum dots in the Fabry–Pérot regime. We show sensitivity to input charge as high as 5×10−6 e/Hz1/2 with a carrier frequency of 719 MHz at 4.2 K. This result is comparable to the best values of charge sensitivity so far reported for radio frequency single electron transistors (rf-SET). Unlike SETs, whose operating temperature is limited as Coulomb blockade vanishes as 1/T, a RTT can operate at higher temperatures, since the dephasing length lϕ∝1/T2/3.

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Highly sensitive and broadband carbon nanotube radio-frequency single-electron transistor

Cited by 21 publications

References 29 publications

Thermal shot noise in top-gated single carbon nanotube field effect transistors

Thermal shot noise in top-gated single carbon nanotube field effect transistors

Charge and Spin State Readout of a Double Quantum Dot Coupled to a Resonator

rf-electrometer using a carbon nanotube resonant tunneling transistor

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