Relaxation, dephasing, and quantum control of electron spins in double quantum dots

Abstract

Recent experiments have demonstrated quantum manipulation of two-electron spin states in double quantum dots using electrically controlled exchange interactions. Here, we present a detailed theory for electron spin dynamics in two-electron double dot systems that was used to guide these experiments and analyze experimental results. The theory treats both charge and spin degrees of freedom on an equal basis. Specifically, we analyze the relaxation and dephasing mechanisms that are relevant to experiments and discuss practical approaches for quantum control of two-electron system. We show that both charge and spin dephasing play important roles in the dynamics of the two-spin system, but neither represents a fundamental limit for electrical control of spin degrees of freedom in semiconductor quantum bits.

18 pages, 10 figures (reduced in length from V1, removed extraneous content, added references)

References in corpus (16)

• Single-shot read-out of an individual electron spin in a quantum dot
• Driven coherent oscillations of a single electron spin in a quantum dot
• Hyperfine interaction in a quantum dot: Non-Markovian electron spin dynamics
• Zeeman energy and spin relaxation in a one-electron quantum dot
• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Theory of electron spin decoherence by interacting nuclear spins in a quantum dot
• Quantum theory for electron spin decoherence induced by nuclear spin dynamics in semiconductor quantum computer architectures: Spectral diffusion of localized electron spins in the nuclear solid-state environment
• Singlet-triplet decoherence due to nuclear spins in a double quantum dot
• Multiple-pulse coherence enhancement of solid state spin qubits
• Universal set of quantum gates for double-dot spin qubits with fixed interdot coupling
• Experimental signature of phonon-mediated spin relaxation
• Effect of Exchange Interaction on Spin Dephasing in a Double Quantum Dot
• Universal Scaling of Hyperfine-Induced Electron Spin Echo Decay
• Dynamical control of electron spin coherence in a quantum dot
• Dynamical nuclear spin polarization and the Zamboni effect in gated double quantum dots
• Spin Decoherence from Hamiltonian dynamics in Quantum Dots

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