Low-noise conditional operation of singlet-triplet coupled quantum dot qubits

Abstract

We theoretically study the influence of charge noise on a controlled phase gate, implemented using two proximal double quantum dots coupled electrostatically. Using the configuration interaction method, we present a full description of the conditional control scheme and quantitatively calculate the gate error arising from charge fluctuations. Our key finding is that the existence of noise-immune sweet spots depends on not only the energy detuning but also the device geometry. The conditions for sweet spots with minimal charge noise are predicted analytically and verified numerically. Going beyond the simple sweet-spot concept we demonstrate the existence of other optimal situations for fast and low-noise singlet-triplet two-qubit gates.

4 pages, 4 figures

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Cited by in corpus (12)

• Screening of charged impurities with multi-electron singlet-triplet spin qubits in quantum dots
• Controllable exchange coupling between two singlet-triplet qubits
• Six-electron semiconductor double quantum dot qubits
• Spin decoherence in a two-qubit CPHASE gate: the critical role of tunneling noise
• Capacitively coupled singlet-triplet qubits in the double charge resonant regime
• Suppression of charge noise using barrier control of a singlet-triplet qubit
• Charge noise suppression in capacitively coupled singlet-triplet spin qubits under magnetic field
• Energy spectrum, exchange interaction and gate crosstalk in a pair of double-quantum-dot system: a molecular orbital calculation
• Robust entangling gate for capacitively coupled few-electron singlet-triplet qubits
• A robust operating point for capacitively coupled singlet-triplet qubits
• Universal control of superexchange in linear triple quantum dots with an empty mediator
• On the validity of microscopic calculations of double-quantum-dot spin qubits based on Fock-Darwin states