Programmable two-qubit gates in capacitively coupled flopping-mode spin qubits

Abstract

Recent achievements in the field of gate defined semiconductor quantum dots reinforce the concept of a spin-based quantum computer consisting of nodes of locally connected qubits which communicate with each other via superconducting circuit resonator photons. In this work we theoretically demonstrate a versatile set of quantum gates between adjacent spin qubits defined in semiconductor quantum dots situated within the same node of such a spin-based quantum computer. The electric dipole acquired by the spin of an electron that moves across a double quantum dot potential in a magnetic field gradient has enabled strong coupling to resonator photons and low-power spin control. Here we show that this flopping-mode spin qubit also provides with the tunability to program multiple two-qubit gates. Since the capacitive coupling between these qubits brings about additional dephasing, we calculate the estimated infidelity of different two-qubit gates in the most immediate possible experimental realizations.

6 pages, 5 figures + 3 pages of supplemental material

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Cited by in corpus (8)

• Semiconductor Spin Qubits
• Crosstalk analysis for single-qubit and two-qubit gates in spin qubit arrays
• Low dephasing and robust micromagnet designs for silicon spin qubits
• Flopping-mode spin qubit in a Si-MOS quantum dot
• Crosstalk analysis for simultaneously driven two-qubit gates in spin qubit arrays
• Flopping-mode electron dipole spin resonance in the strong-driving regime
• Robust entangling gate for capacitively coupled few-electron singlet-triplet qubits
• Resonator-mediated quantum gate between distant charge qubits