Electrical control of uniformity in quantum dot devices

• URL: http://arxiv.org/abs/2211.13493v1
• Date: Thu, 24 Nov 2022 09:32:06 GMT
• Title: Electrical control of uniformity in quantum dot devices
• Authors: Marcel Meyer, Corentin D\'eprez, Timo R. van Abswoude, Dingshan Liu, Chien-An Wang, Saurabh Karwal, Stefan Oosterhout, Franscesco Borsoi, Amir Sammak, Nico W. Hendrickx, Giordano Scappucci, and Menno Veldhorst
• Abstract summary: We present a method to electrically obtain a high degree of uniformity in the intrinsic potential landscape. We demonstrate the tuning of pinch-off voltages in quantum dot devices over hundreds of millivolts. This work provides a new tool for the tuning of quantum dot devices and offers new perspectives for the implementation of scalable spin qubit arrays.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Highly uniform quantum systems are essential for the practical implementation of scalable quantum processors. While quantum dot spin qubits based on semiconductor technology are a promising platform for large-scale quantum computing, their small size makes them particularly sensitive to their local environment. Here, we present a method to electrically obtain a high degree of uniformity in the intrinsic potential landscape using hysteretic shifts of the gate voltage characteristics. We demonstrate the tuning of pinch-off voltages in quantum dot devices over hundreds of millivolts that then remain stable at least for hours. Applying our method, we homogenize the pinch-off voltages of the plunger gates in a linear array for four quantum dots reducing the spread in pinch-off voltage by one order of magnitude. This work provides a new tool for the tuning of quantum dot devices and offers new perspectives for the implementation of scalable spin qubit arrays.

Related papers

• Cavity-Quantum Electrodynamics with Moiré Flatband Photonic Crystals [35.119260614523256]
  A quantum dot can be tuned by a factor of 40, ranging from 42 ps to 1692 ps, which is attributed to strong Purcell enhancement and Purcell inhibition effects. Our findings pave the way for moir'e flatband cavity-enhanced quantum light sources, quantum optical switches, and quantum nodes for quantum internet applications.
  arXiv  Detail & Related papers  (2024-11-25T18:52:11Z)
• Enhanced quantum state transfer: Circumventing quantum chaotic behavior [35.74056021340496]
  We show how to transfer few-particle quantum states in a two-dimensional quantum network. Our approach paves the way to short-distance quantum communication for connecting distributed quantum processors or registers.
  arXiv  Detail & Related papers  (2024-02-01T19:00:03Z)
• Near-Term Distributed Quantum Computation using Mean-Field Corrections and Auxiliary Qubits [77.04894470683776]
  We propose near-term distributed quantum computing that involve limited information transfer and conservative entanglement production. We build upon these concepts to produce an approximate circuit-cutting technique for the fragmented pre-training of variational quantum algorithms.
  arXiv  Detail & Related papers  (2023-09-11T18:00:00Z)
• Single-electron occupation in quantum dot arrays at selectable plunger gate voltage [0.0]
  Currently, each device requires tailored gate voltages to confine a single charge per quantum dot, clearly challenging scalability. Here, we tune these gate voltages and equalize them solely through the temporary application of stress voltages. The ability to define required gate voltages may relax requirements on control electronics and operations for spin qubit devices, providing means to advance quantum hardware.
  arXiv  Detail & Related papers  (2023-09-07T09:34:04Z)
• Shared control of a 16 semiconductor quantum dot crossbar array [0.0]
  We introduce the shared control of semiconductor quantum dots to efficiently operate a two-dimensional crossbar array in planar germanium. We establish a method for the selective control of the quantum dots interdot coupling and achieve a tunnel coupling tunability over more than 10 GHz.
  arXiv  Detail & Related papers  (2022-09-14T12:59:50Z)
• A quantum processor based on coherent transport of entangled atom arrays [44.62475518267084]
  We show a quantum processor with dynamic, nonlocal connectivity, in which entangled qubits are coherently transported in a highly parallel manner. We use this architecture to realize programmable generation of entangled graph states such as cluster states and a 7-qubit Steane code state.
  arXiv  Detail & Related papers  (2021-12-07T19:00:00Z)
• Squeezed hole spin qubits in Ge quantum dots with ultrafast gates at low power [0.0]
  Hole spin qubits in planar Ge heterostructures are one of the frontrunner platforms for scalable quantum computers. We propose a minimal design modification that enhances these interactions by orders of magnitude. Our approach is based on an asymmetric potential that strongly squeezes the quantum dot in one direction.
  arXiv  Detail & Related papers  (2021-03-30T23:46:07Z)
• Quantum Phases of Matter on a 256-Atom Programmable Quantum Simulator [41.74498230885008]
  We demonstrate a programmable quantum simulator based on deterministically prepared two-dimensional arrays of neutral atoms. We benchmark the system by creating and characterizing high-fidelity antiferromagnetically ordered states. We then create and study several new quantum phases that arise from the interplay between interactions and coherent laser excitation.
  arXiv  Detail & Related papers  (2020-12-22T19:00:04Z)
• Gate reflectometry in dense quantum dot arrays [18.131612654397884]
  We perform gate-voltage pulsing and gate-based reflectometry measurements on a dense 2$times$2 array of silicon quantum dots fabricated in a 300-mm-wafer foundry. Our techniques may find use in the scaling of few-dot spin-qubit devices to large-scale quantum processors.
  arXiv  Detail & Related papers  (2020-12-08T23:51:19Z)
• Voltage tunable quantum dot array by patterned Ge-nanowire based metal-oxide-semiconductor (MOS) devices [0.0]
  fabrication of voltage tunable quantum dots at room temperature. characterization of quantum confinement of electrons. characterization of transport properties based on non-equilibrium Green's function (NEGF) formalism.
  arXiv  Detail & Related papers  (2020-11-11T11:11:18Z)
• Entanglement transfer, accumulation and retrieval via quantum-walk-based qubit-qudit dynamics [50.591267188664666]
  Generation and control of quantum correlations in high-dimensional systems is a major challenge in the present landscape of quantum technologies. We propose a protocol that is able to attain entangled states of $d$-dimensional systems through a quantum-walk-based it transfer & accumulate mechanism. In particular, we illustrate a possible photonic implementation where the information is encoded in the orbital angular momentum and polarization degrees of freedom of single photons.
  arXiv  Detail & Related papers  (2020-10-14T14:33:34Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.