Low-decoherence flux qubit
By J. You, Xuedong Hu, Sahel Ashhab, Franco Nori. OSA Workshop on Entanglement and Quantum Decoherence, 2006
213 citations recorded by the source corpus.
A flux qubit can have a relatively long decoherence time at the degeneracy point, but away from this point the decoherence time is greatly reduced by dephasing. This limits the practical applications of flux qubits. Here we propose a new qubit design modified from the commonly used flux qubit by introducing an additional capacitor shunted in parallel to the smaller Josephson junction (JJ) in the loop. Our results show that the effects of noise can be considerably suppressed, particularly away from the degeneracy point, by both reducing the coupling energy of the JJ and increasing the shunt capacitance. This shunt capacitance provides a novel way to improve the qubit.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/4a4af1ab35a26ffdfb81e77d949cb55350346c5b
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In Artificial Intelligence
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Quantum feedback: theory, experiments, and applications (2014, background): “The controlled quantum system is a capaciti vely shunted Josephson junction which works as a superconducting qubit [408, 409] with a transition frequen cy ofωq/2π = 5.”
- Quantum information processing with superconducting circuits: a review (2016, background): “The Cshunt flux qubit [138, 139] is usually viewed as a 3JJ flux qubit shunted by a large capac itance.”
- Materials challenges and opportunities for quantum computing hardware (2021, background): “The capacitively shunted flux qubit ( 41 , 42 ) consists of three Josephson junctions forming a superconducting quantum interference device (SQUID) loop ( 43 ), shunted by a large capacitor where the qubit state is an energy eigenstate of the persistent current in the SQUID loop (the magnetic flux…”
- 1 / f noise: Implications for solid-state quantum information (2013, background): “A complementary proposal for using a capacitor to modify the EJ/EC ratio in superconducting flux qubits is put forward by You et al. (2007) At the same time, the large gate capacitor provides strong coupling to external microwaves even at the level of a single photon, greatly increasing coupling…”
- Hybrid quantum circuits: Superconducting circuits interacting with other quantum systems (2012, background): “The development ofmore advanced SC qubit designs (Koch et al., 2007; You et al., 2007; Manucharyan et al., 2009) recently ameliorated this problem.”
- Introduction to quantum electromagnetic circuits (2016, background): “To decrease this sensitivity, a variant of the flux qubit [45] has been proposed in which its EJ∕EC ratio is reduced.”
- Microwave photonics with superconducting quantum circuits (2017, background): “To circumvent this limitation, a shunt capacitor can be introduced [46] to the smaller junction in the three-junction”