Universal quantum gates on microwave photons assisted by circuit quantum electrodynamics

Hua, Ming; Tao, Ming‐Jie; Deng, Fu‐Guo

doi:10.1103/physreva.90.012328

Cited by 71 publications

(63 citation statements)

References 81 publications

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“…Within circuit QED, several theoretical proposals have been put forward for utilizing microwave photons stored in two superconducting CPW resonators as qubits/qudits for quantum gates [69][70][71][72]. (2) Microwave photons have been considered as candidates for quantum memories [61,[73][74][75].…”

Section: Experimental Implementationmentioning

confidence: 99%

One-step transfer or exchange of arbitrary multipartite quantum states with a single-qubit coupler

Yang

Zheng

et al. 2015

Phys. Rev. B

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The transfer or exchange of multipartite quantum states is critical to the realization of large-scale quantum information processing and quantum communication. In this work, we demonstrate that by using a single quantum two-level system -qubit -as a coupler arbitrary multipartite quantum states (either entangled or separable) can be transferred or exchanged simultaneously between two sets of qubits. During the entire process the coupler remains unexcited minimizing the effect of coupler decoherence on the process. This feature allows one to use qubits with rapid frequency tunability and large range of frequency tuning, such as phase qubits, as couplers. Our findings offer the potential to significantly reduce the resources needed to construct and operate largescale quantum information networks consisting of many multi-qubit registers, memory cells, and processing units.

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Section: Experimental Implementationmentioning

confidence: 99%

One-step transfer or exchange of arbitrary multipartite quantum states with a single-qubit coupler

Yang

Zheng

et al. 2015

Phys. Rev. B

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“…QIP based on SRs has been studied a lot recently both in theory and in experiment, such as the generation of quantum entanglement [63][64][65][66][67], the construction of universal quantum logical gates [25,[68][69][70], and the nondemolition detection of single microwave photon in a SR [71]. To realize large-scale QIP, lots of resonators should be coupled together, which leads to the crosstalk among them.…”

Section: Introductionmentioning

confidence: 99%

Entangling two high-Q microwave resonators assisted by a resonator terminated with SQUIDs

2019

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We propose a superconducting circuit for quantum information processing (QIP) on high-quality (high-Q) superconducting resonators (SRs). In the circuit, two high-Q SRs are coupled to a highfrequency SR (acts as a quantum bus) assisted by superconducting quantum interference devices (SQUIDs) terminate in both ends of the high-frequency resonator. Each coupling strength between each high-Q resonator and the high-frequency resonator can be tuned independently from zero to the strong-coupling regime via the external flux threading through the SQUID. In the circuit, the frequencies of the two high-Q resonators are far detuned from the high-frequency resonator. That is, quantum information stored in high-Q resonators cannot be populated in the high-frequency resonator, which lets the bus can be designed to link lots of high-Q resonators for the large-scale QIP. To show the circuit can be used to achieve the QIP, we present a high-fidelity scheme to generate Bell state on the two high-Q resonators. The scheme shows that, to achieve the entanglement operation on high-Q resonators, fast tuning on the coupling is no longer mandatory and the coupling strengths are not required to be turned on or off simultaneously. = = = = , where subscripts l and r label the left SQUID and the right SQUID respectively. The characteristic capacitance and inductance of resonator C are treated as constants (c c (y)=c 0 and l c (y)=l 0 ). The flux across each junction of the SQUID is Ji F b (β=l, r and i=1, 2). The external flux can be written as l J l J l ext 1 2

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“…In addition, experimental realization of a three-qubit controlled phase gate in NMR quantum system [9] and a three-qubit Toffoli gate with superconducting qubits [10] has been reported. On the other hand, based on cavity or circuit QED, many theoretical proposals have been presented for directly realizing not only multi-control-qubit gates [11][12][13][14][15][16][17][18][19][20][21][22] but also multi-target-qubit gates [23][24][25][26][27], in various physical qubits.…”

Section: Introductionmentioning

confidence: 99%

One-step implementation of a multi-target-qubit controlled phase gate with cat-state qubits in circuit QED

et al. 2018

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We propose a single-step implementation of a muti-target-qubit controlled phase gate with one cat-state qubit (cqubit) simultaneously controlling n − 1 target cqubits. The two logic states of a cqubit are represented by two orthogonal cat states of a single cavity mode. In this proposal, the gate is implemented with n microwave cavities coupled to a superconducting transmon qutrit.Because the qutrit remains in the ground state during the gate operation, decoherence caused due to the qutrit's energy relaxation and dephasing is greatly suppressed. The gate implementation is quite simple because only a single-step operation is needed and neither classical pulse nor measurement is required. Numerical simulations demonstrate that high-fidelity realization of a controlled phase gate with one cqubit simultaneously controlling two target cqubits is feasible with present circuit QED technology. This proposal can be extended to a wide range of physical systems to realize the proposed gate, such as multiple microwave or optical cavities coupled to a natural or artificial three-level atom.

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Universal quantum gates on microwave photons assisted by circuit quantum electrodynamics

Cited by 71 publications

References 81 publications

One-step transfer or exchange of arbitrary multipartite quantum states with a single-qubit coupler

One-step transfer or exchange of arbitrary multipartite quantum states with a single-qubit coupler

Entangling two high-Q microwave resonators assisted by a resonator terminated with SQUIDs

One-step implementation of a multi-target-qubit controlled phase gate with cat-state qubits in circuit QED

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