Zhuo-Ping Hong

Implementing universal nonadiabatic holonomic quantum gates with transmons

  1. Zhuo-Ping Hong,
  2. Bao-Jie Liu,
  3. Jia-Qi Cai,
  4. Xin-Ding Zhang,
  5. Yong Hu,
  6. Z. D. Wang,
  7. and Zheng-Yuan Xue
Geometric phases are well known to be noise-resilient in quantum evolutions/operations. Holonomic quantum gates provide us with a robust way towards universal quantum computation, as
these quantum gates are actually induced by nonabelian geometric phases. Here we propose and elaborate how to efficiently implement universal nonadiabatic holonomic quantum gates on simpler superconducting circuits, with a single transmon serving as a qubit. In our proposal, an arbitrary single-qubit holonomic gate can be realized in a single-loop scenario, by varying the amplitudes and phase difference of two microwave fields resonantly coupled to a transmon, while nontrivial two-qubit holonomic gates may be generated with a transmission-line resonator being simultaneously coupled to the two target transmons in an effective resonant way. Moreover, our scenario may readily be scaled up to a two-dimensional lattice configuration, which is able to support large scalable quantum computation, paving the way for practically implementing universal nonadiabatic holonomic quantum computation with superconducting circuits.
arxiv pdf

Nonadiabatic Holonomic Quantum Computation with Dressed-state Qubits

  1. Zheng-Yuan Xue,
  2. Feng-Lei Gu,
  3. Zhuo-Ping Hong,
  4. Zi-He Yang,
  5. Dan-Wei Zhang,
  6. Yong Hu,
  7. and J. Q. You
Implementing holonomic quantum computation is a challenging task as it requires complicated interaction among multilevel systems. Here, we propose to implement nonadiabatic holonomic
quantum computation based on dressed-state qubits in circuit QED. An arbitrary holonomic single-qubit gate can be conveniently achieved using external microwave fields and tuning their amplitudes and phases. Meanwhile, nontrivial two-qubit gates can be implemented in a coupled cavities scenario assisted by a grounding SQUID with tunable interaction, where the tuning is achieved by modulating the ac flux threaded through the SQUID. In addition, our proposal is directly scalable, up to a two-dimensional lattice configuration. In our scheme, the dressed states only involve the lowest two levels of each transmon qubits and the effective interactions exploited are all of resonant nature. Therefore, we release the main difficulties for physical implementation of holonomic quantum computation on superconducting circuits.
arxiv pdf