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Chinese Physics B

Scheme for realizing quantum computation and quantum information transfer with superconducting qubits coupling to a 1D transmission line resonator

Shi Zhen-Gang, Xiongwen Chen, Zhu Xi-Xiang, Kehui Song

Published Mar 1, 2009• 14 citations
Publisher

Abstract

Scheme for realizing quantum computation and quantum information transfer with superconducting qubits coupling to a 1D transmission line resonator, Shi Zhen-Gang, Chen Xiong-Wen, Zhu Xi-Xiang, Song Ke-Hui
DOI
10.1088/1674-1056/18/3/011

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We consider a one-dimensional array of superconducting transmission line resonators (TLRs). The TLRs are coupled by current-biased Josephson junctions, which act as tunable couplers between each two nearest TLRs, and a superconducting qubit is fabricated in the center of each TLR. We show that some important quantum information processing, such as quantum state transfer and preparation of remote entanglement, can be achieved in this system, and we also propose a scheme for generating the W-class states.
We propose a method to emulate the exciton energy transfer (EET) of photosynthetic complexes in a quantum superconducting circuit. Our system is composed of two pairs of superconducting charge qubits coupled to two separated high-Q superconducting transmission line resonators (TLRs), respectively. The two TLRs interact with each other capacitively. When the frequencies of the qubits are largely detuned from those of the TLRs, we simulate the process of EET from the first qubit to the fourth qubit. By tuning the couplings between the qubits and the TLRs, as well as the coupling between the two TLRs, we can modify the effective coupling strengths between the qubits and thus study the geometric effects on the EET. It is shown that a moderately clustered geometry supports optimal EET by using exciton delocalization and an energy matching condition. And the population loss during the EET has been trapped in the two TLRs.
Under an external magnetic field, a high-quality TiN nanowire superconducting microwave resonator exhibits anisotropic frequency shifts as the field orientation rotates, mapping a peanut-like surface whose principal axes coincide with the device coordinate system. This enables precisely quantifying the field orientation relative to the resonator at cryogenic temperatures with a single device, a capability highly desirable for quantum information applications. More in article number e70464, Xiang-Xiang Song, Gang Cao, and co-workers.