Abstract
Quantum coherence is an important enabling feature underpinning quantum computation. However, because of couplings with its noisy surrounding environment, qubits suffer from the decoherence effects. The dynamical decoupling (DD) technique uses pulse-induced qubit flips to effectively mitigate couplings between qubits and environment. Optimal DD eliminates dephasing up to a given order with the minimum number of pulses. In this paper, we first introduce our recent work on prolonging electron spin coherence in γ-irradiated malonic acid crystals and analyze different decoherence mechanisms in this solid system. Then we focus on electron spin relaxation properties in another system, phosphorous-doped silicon (Si:P) crystals. These properties have been investigated by pulse electron paramagnetic resonance (EPR). We also investigate the performance of the dynamical decoupling technique on this system. Using 8-pulse periodic DD, the coherence time can be extended to 296 μs compared with 112 μs with one-pulse control.
Highlights
Quantum coherence is an important enabling feature underpinning quantum computation
We first introduce our recent work on prolonging electron spin coherence in γ-irradiated malonic acid crystals and analyze different decoherence mechanisms in this solid system
We investigate the performance of the dynamical decoupling technique on this system
Summary
We present recent work on prolonging electron spin coherence in γ-irradiated malonic acid crystals by DD pulse sequences [23]. The concentration of radical electron spins in the crystal is determined by a comparison of the spectrum to that of a standard sample (TEMPO), under the same experimental conditions. To obtain different concentrations of radicals, the samples were prepared by irradiated at various dose rates and for various durations of time. We address the ensembles of electron spins for the enhancement of the signal In such ensembles, we can investigate the decoherence caused by couplings between qubits that continues to be a pertinent issue in large-scale quantum computation. The N spin-flip pulses in either UDD or PDD sequences (see Figure 1(c)) were applied to prolonging the electron spin coherence.
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