Efficient generation of NOON states on two microwave-photon resonators

Abstract

We present an efficient scheme for the generation of NOON states of photons in circuit QED assisted by a superconducting charge qutrit. It is completed with two kinds of manipulations, that is, the resonant operation on the qutrit and the resonator, and the single-qubit operation on the qutrit, and they both are high-fidelity operations. Compared with the one by a superconducting transmon qutrit proposed by Su et al. (Sci. Rep. 4, 3898 (2014)), our scheme does not require to maintain the qutrit in the third excited state with a long time, which relaxes the difficulty of its implementation in experiment. Moreover, the level anharmonicity of a charge qutrit is larger and it is better for us to tune the different transitions of the charge qutrit resonant to the resonator, which makes our scheme faster than others.Comment: 6 pages, 1 figur

Universal remote quantum computation assisted by the cavity input–output process

“…Thus our four Toffoli gates are deterministic and faithful. However, the side leakage from the cavity is unavoidable in the experiment [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. In this case, the reflectance coefficients r 0 and r h are shown in figure 7.…”

“…Recent results have shown that quantumdot spins in one-sided optical microcavities or double-sided optical microcavities [28][29][30][31][32] may provide a giant optical circular birefringence. With its superiorities, the cavity-quantum electrodynamics (QED) system has been widely used in quantum information processing [33][34][35][36][37][38][39][40][41][42], entanglement concentration [43][44][45][46][47][48][49] and scalable quantum computing [50][51][52][53][54][55][56]. For simplicity, by exploring the giant optical-controlled gate induced by quantum-dot spins in one-sided optical microcavities, a Toffoli gate may be deterministically implemented on remote threespin systems using only one photonic Einstein-Podolsky-Rosen (EPR) pair or EPR pair of spin systems and local quantum operations and classical communication (LOCC).…”

Multiphoton Controllable Transport between Remote Resonators

“…Despite such substantial developments, prior work on controllable photon transport has typically focused upon either single photons [22,38,[42][43][44] or nearby CRAs [45][46][47][48][49]. However, the ability to transport multiphoton quantum states is a key requirement for encoding a high-dimensional Hilbert space, which is applicable, for example, to universal quantum computation [50][51][52]; at the same time, quantum information stored in the multiphoton fields needs to be controllably transported between two distant quantum registers to carry out quantum network operations. For these reasons, developing a quantum channel capable of controllably transporting multiphoton states is thus of both fundamental and practical importance.…”

Quantum state transfer and controlled-phase gate on one-dimensional superconducting resonators assisted by a quantum bus

“…Interestingly, the quality factor of a one-dimensional (1D) superconducting resonator 39 has been enhanced to 10 6 , which makes the resonator as a good carrier for quantum information processing 40 41 42 43 44 45 46 47 48 49 50 51 52 . For instance, Houck et al 53 generated single microwave photons in a circuit in 2007.…”