Non-reciprocal Pauli Spin Blockade in a Silicon Double Quantum Dot

Abstract

Spin qubits in gate-defined silicon quantum dots are receiving increased attention thanks to their potential for large-scale quantum computing. Readout of such spin qubits is done most accurately and scalably via Pauli spin blockade (PSB), however various mechanisms may lift PSB and complicate readout. In this work, we present an experimental observation of a new, highly prevalent PSB-lifting mechanism in a silicon double quantum dot due to incoherent tunneling between different spin manifolds. Through dispersively-detected magnetospectroscopy of the double quantum dot in 16 charge configurations, we find the mechanism to be energy-level selective and non-reciprocal for neighbouring charge configurations. Additionally, using input-output theory we report a large coupling of different electron spin manifolds of 7.90 $\mu$eV, the largest reported to date, indicating an enhanced spin-orbit coupling which may enable all-electrical qubit control.

12 pages, 10 figures. Minor updates to notation

References in corpus (22)

• Charge insensitive qubit design derived from the Cooper pair box
• Single-shot read-out of an individual electron spin in a quantum dot
• An addressable quantum dot qubit with fault-tolerant control fidelity
• Circuit Quantum Electrodynamics with a Spin Qubit
• Qubits made by advanced semiconductor manufacturing
• CMOS-based cryogenic control of silicon quantum circuits
• A hole spin qubit in a fin field-effect transistor above 4 kelvin
• Rapid high-fidelity gate-based spin read-out in silicon
• A single hole spin with enhanced coherence in natural silicon
• A Radio Frequency Charge Parity Meter
• On-demand electrical control of spin qubits
• Strong electron-electron interactions in Si/SiGe quantum dots
• An electrically driven spin qubit based on valley mixing
• Coherent control and spectroscopy of a semiconductor quantum dot Wigner molecule
• Coherent control of electron spin qubits in silicon using a global field
• A silicon-based single-electron interferometer coupled to a fermionic sea
• Two-body Wigner molecularization in asymmetric quantum dot spin qubits
• Bell-state tomography in a silicon many-electron artificial molecule
• Small-signal equivalent circuit for double quantum dots at low-frequencies
• Classification and magic magnetic-field directions for spin-orbit-coupled double quantum dots
• Variable and orbital-dependent spin-orbit field orientations in a InSb double quantum dot characterized via dispersive gate sensing
• Charge-noise resilience of two-electron quantum dots in Si/SiGe heterostructures

Cited by in corpus (6)

• Unified linear response theory of quantum electronic circuits
• Polarimetry With Spins in the Solid State
• Electrical readout of spins in the absence of spin blockade
• Pauli spin blockade at room temperature in double-quantum-dot tunneling through individual deep dopants in silicon
• Finite-frequency noise, Fano factor, $\Delta T$-noise and cross-correlations in double quantum dots
• Four-state discrimination for a pair of spin qubits via gate reflectometry