State Initialization of a Hot Spin Qubit in a Double Quantum Dot by Measurement-Based Quantum Feedback Control
arXiv:2204.02565 · doi:10.1103/PhysRevB.106.235309
Abstract
A measurement-based quantum feedback protocol is developed for spin state initialization in a gate-defined double quantum dot spin qubit coupled to a superconducting resonator. The protocol improves qubit state initialization as it is able to robustly prepare the spin in shorter time and reach a higher fidelity, which can be pre-set. Being able to pre-set the fidelity aimed at is a highly desired feature enabling qubit initialization to be more deterministic. The protocol developed herein is also effective at high temperatures, which is critical for the current efforts towards scaling up the number of qubits in quantum computers.
arXiv comment11 pages, 8 figures
References in corpus (39)
- Quantum Computation with Quantum Dots
- Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
- Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
- Spins in few-electron quantum dots
- QuTiP 2: A Python framework for the dynamics of open quantum systems
- Silicon Quantum Electronics
- Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
- An addressable quantum dot qubit with fault-tolerant control fidelity
- Electron spin coherence exceeding seconds in high purity silicon
- Interfacing spin qubits in quantum dots and donors - hot, dense and coherent
- Real-time quantum feedback prepares and stabilizes photon number states
- Fast universal quantum control above the fault-tolerance threshold in silicon
- Progressive field-state collapse and quantum non-demolition photon counting
- A Coherent Spin-Photon Interface in Silicon
- A four-qubit germanium quantum processor
- Silicon CMOS architecture for a spin-based quantum computer
- Silicon quantum processor unit cell operation above one Kelvin
- Universal quantum logic in hot silicon qubits
- Strong Coupling of a Single Electron in Silicon to a Microwave Photon
- CMOS-based cryogenic control of silicon quantum circuits
- Quantum back-action of variable-strength measurement
- A Crossbar Network for Silicon Quantum Dot Qubits
- Coherent coupling of a single spin to microwave cavity photons
- A hole spin qubit in a fin field-effect transistor above 4 kelvin
- Heralded state preparation in a superconducting qubit
- Initialization by measurement of a two-qubit superconducting circuit
- Coherent spin qubit transport in silicon
- Input-output theory for spin-photon coupling in Si double quantum dots
- A discrete invitation to quantum filtering and feedback control
- Strong coupling of spin qubits to a transmission line resonator
- Quantum feedback by discrete quantum non-demolition measurements: towards on-demand generation of photon-number states
- Micro-magnets for coherent control of spin-charge qubit in lateral quantum dots
- Coupling a single electron spin to a microwave resonator: Controlling transverse and longitudinal couplings
- Charge detection in an array of CMOS quantum dots
- Silicon quantum dot devices with a self-aligned second gate layer
- Flopping-mode electric dipole spin resonance
- Optimal dispersive readout of a spin qubit with a microwave resonator
- Ambipolar quantum dots in undoped silicon fin field-effect transistors
- Closing a quantum feedback loop inside a cryostat: Autonomous state preparation and long-time memory of a superconducting qubit