Hong-Yi Dai

Probabilistic teleportation of an arbitrary two-particle state by two partial three-particle entangled W states

We present a scheme for teleporting an arbitrary and unknown two-particle state from a sender to either one of two receivers. The quantum channel is composed of two non-maximally three-particle entangled W states. An arbitrary two-particle state can be perfectly teleported probabilistically if both the sender performs two generalized Bell-state measurements and either one of two receivers adopts an appropriate unitary transformation, conditioned on the suitable measurement outcomes of the other receiver and classical information.

Scalable one-way quantum computer using on-chip resonator qubits

College of Science, National University of Defense Technology, Changsha 410073, People’s Republic of China(Dated: November 14, 2011)We propose a scalable and robust architecture for one-way quantum computation using couplednetworks of superconducting transmission line resonators. In our protocol, quantum information isencoded into the long-lived photon states of the resonators, which have a much longer coherencetime than the usual superconducting qubits. Each resonator contains a charge qubit used for thestate initialization and local projective measurement of the photonic qubit. Any pair of neighboringphotonic qubits are coupled via a mediator charge qubit, and large photonic cluster states can becreated by applying Stark-shifted Rabi pulses to these mediator qubits. The distinct advantage ofour architecture is that it combines both the excellent scalability of the solid-state systems and thelong coherence time of the photonic qubits. Furthermore, this architecture is very robust againstthe parameter variations.

Quantum superposition of localized and delocalized phases of photons

Abstract Based on a variant of 2-site Jaynes–Cummings–Hubbard model constructed using superconducting circuits, we propose a method to coherently superpose the localized and delocalized phases of microwave photons, which makes it possible to engineer the collective features of multiple photons in the quantum way using an individual two-level system. Our proposed architecture is also a promising candidate for implementing distributed quantum computation since it is capable of coupling remote qubits in separate resonators in a controllable way.