Democratizing Spin Qubits

Abstract

I've been building Powerpoint-based quantum computers with electron spins in silicon for 20 years. Unfortunately, real-life-based quantum dot quantum computers are harder to implement. Materials, fabrication, and control challenges still impede progress. The way to accelerate discovery is to make and measure more qubits. Here I discuss separating the qubit realization and testing circuitry from the materials science and on-chip fabrication that will ultimately be necessary. This approach should allow us, in the shorter term, to characterize wafers non-invasively for their qubit-relevant properties, to make small qubit systems on various different materials with little extra cost, and even to test spin-qubit to superconducting cavity entanglement protocols where the best possible cavity quality is preserved. Such a testbed can advance the materials science of semiconductor quantum information devices and enable small quantum computers. This article may also be useful as a light and light-hearted introduction to quantum dot spin qubits.

arXiv commentor, How to make semiconductor-based quantum computers without fabricating quantum dot qubits; Based on talks I gave at the ARO/LPS Quantum Computing Program Review, August 2018, and 4th School and Conference on Spin-Based Quantum Information Processing, September 2018. Comments and feedback welcome

References in corpus (67)

• Quantum Computation with Quantum Dots
• Charge insensitive qubit design derived from the Cooper pair box
• Spins in few-electron quantum dots
• Decoherence Free Subspaces for Quantum Computation
• Silicon Quantum Electronics
• Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture
• A Two Qubit Logic Gate in Silicon
• Universal Quantum Computation with the Exchange Interaction
• A >99.9%-fidelity quantum-dot spin qubit with coherence limited by charge noise
• A programmable two-qubit quantum processor in silicon
• Electron spin coherence exceeding seconds in high purity silicon
• Quantum CNOT Gate for Spins in Silicon
• Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
• Prospects for Spin-Based Quantum Computing
• Universal quantum computation with spin-1/2 pairs and Heisenberg exchange
• A four-qubit germanium quantum processor
• Strong spin-photon coupling in silicon
• Silicon quantum processor unit cell operation above one Kelvin
• Universal Fault-Tolerant Computation on Decoherence-Free Subspaces
• Universal quantum logic in hot silicon qubits
• Strong Coupling of a Single Electron in Silicon to a Microwave Photon
• Reduced sensitivity to charge noise in semiconductor spin qubits via symmetric operation
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• Shuttling a single charge across a one-dimensional array of silicon quantum dots
• 3D integrated superconducting qubits
• Towards a quantum representation of the ampere using single electron pumps
• Practical design and simulation of silicon-based quantum dot qubits
• Design and proof of concept for silicon-based quantum dot quantum bits
• Noise suppression using symmetric exchange gates in spin qubits
• Dispersive Readout of a Few-Electron Double Quantum Dot with Fast rf Gate-Sensors
• A high-sensitivity gate-based charge sensor in silicon
• Rapid high-fidelity gate-based spin read-out in silicon
• Charge and spin state readout of a double quantum dot coupled to a resonator
• Low-frequency charge noise in Si/SiGe quantum dots
• A Reconfigurable Gate Architecture for Si/SiGe Quantum Dots
• Gate-controlled quantum dots and superconductivity in planar germanium
• Pauli Spin Blockade in a Highly Tunable Silicon Double Quantum Dot
• Spin lifetime and charge noise in hot silicon quantum dot qubits
• Single-Spin CCD
• Life after charge noise: recent results with transmon qubits
• Electrically-protected resonant exchange qubits in triple quantum dots
• Electrically Protected Valley-Orbit Qubits in Silicon
• Three-electron spin qubits
• Quantum and Tunnelling Capacitance in Charge and Spin Qubits
• Relaxation of excited spin, orbital, and valley qubit states in single electron silicon quantum dots
• Gate-sensing coherent charge oscillations in a silicon field-effect transistor
• Dispersive readout of valley splittings in cavity-coupled silicon quantum dots
• Charge-noise-insensitive gate operations for always-on, exchange-only qubits
• Entangling distant resonant exchange qubits via circuit quantum electrodynamics
• On-chip cavity quantum phonodynamics with an acceptor qubit in silicon
• A quadrupolar exchange-only spin qubit
• High mobility two-dimensional electron system on hydrogen-passivated silicon(111) surfaces
• Single and Double Hole Quantum Dots in Strained Ge/SiGe Quantum Wells
• Measurements of trapped-ion heating rates with exchangeable surfaces in close proximity
• Quantum-limited measurement of spin qubits via curvature coupling to a cavity
• Conditional dispersive readout of a CMOS quantum dot via an integrated transistor circuit
• Fault-Tolerant Quantum Computation for Singlet-Triplet Qubits with Leakage Errors
• Dispersive readout of a silicon quantum dot with an accumulation-mode gate sensor
• Modulated longitudinal gates on encoded spin-qubits via curvature couplings to a superconducting cavity
• Theory of barrier vs tilt exchange gate operations in spin-based quantum computing
• Valley filtering and spatial maps of coupling between silicon donors and quantum dots
• Induced quantum dot probe for material characterization
• Hybrid Exchange Measurement-Based Qubit Operations in Semiconductor Double Quantum Dot Qubits
• Coupling MOS Quantum Dot and Phosphorus Donor Qubit Systems
• A non-invasive method for nanoscale electrostatic gating of pristine materials
• Silicon in the Quantum Limit: Quantum Computing and Decoherence in Silicon Architectures
• A reset-if-leaked procedure for encoded spin qubits

Cited by in corpus (7)

• Semiconductor Qubits In Practice
• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• Probing single electrons across 300 mm spin qubit wafers
• Democratization of Quantum Technologies
• Open Hardware Solutions in Quantum Technology
• Optimization of Quantum-dot Qubit Fabrication via Machine Learning
• Experimental online quantum dots charge autotuning using neural networks