Tunable quantum beam splitters for coherent manipulation of a solid-state tripartite qubit system

Sun, Guozhu; Wen, Xueda; Mao, Bo; Chen, Jian; Yu, Yang; Wu, Peiheng; Han, Siyuan

doi:10.1038/ncomms1050

Cited by 104 publications

(108 citation statements)

References 25 publications

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“…In the language of wave functions, an interference of different zone states, predicted by Stückelberg 11 is possible. As applied to qubits these effects have lately been discussed in numerous works [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] .…”

Section: Introductionmentioning

confidence: 99%

Amplitude spectroscopy of two coupled qubits

2012

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We study the effect of a time-dependent driving field with a large amplitude on a system composed of two coupled qubits (two-level systems). Using the rotating wave approximation (RWA) makes it possible to find simple conditions for resonant excitation of the four-level system. We find that the resonance conditions include the coupling strength between the qubits. Numerical simulations confirm the qualitative conclusions following from the RWA. To reveal the peculiarities of resonant transitions caused by the quasi-level motion and crossing in a periodic driving field, we use Floquet states, which determine the precise intermediate states of the system. Calculating the quasi-energy states of the multi-level system makes it possible to find the transition probabilities and build interference patterns for the transition probabilities. The interference patterns demonstrate the possibility of obtaining various pieces of information about the qubits, since the positions of transition-probability maxima depend on various system parameters, including the coupling strength between the qubits.

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Section: Introductionmentioning

confidence: 99%

Amplitude spectroscopy of two coupled qubits

2012

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“…20,21 With this traditional method, the coupling between a TLS and a qubit results in an anti-crossing (or energy level splitting) on spectroscopy. 5,6,18,19,22,23 However, the visibility of the anti-crossing depends on the width of the resonant peak as well as the measurement resolution. 24 Timeconsuming high resolution spectroscopy measurement hinders the investigation of the dynamic evolution of TLSs in solid-state devices.…”

mentioning

confidence: 99%

“…23,25,26 When initialized in the ground state, it will be excited to the excited state by absorbing resonant microwave photons. A transition peak with width dependent on the decoherence time can be observed.…”

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confidence: 99%

Rapid characterization of microscopic two-level systems using Landau-Zener transitions in a superconducting qubit

Tan

et al. 2015

Applied Physics Letters

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We demonstrate a fast method to detect microscopic two-level systems in a superconducting phase qubit. By monitoring the population leak after sweeping the qubit bias flux, we are able to measure the two-level systems that are coupled with the qubit. Compared with the traditional method that detects two-level systems by energy spectroscopy, our method is faster and more sensitive. This method supplies a useful tool to investigate two-level systems in solid-state qubits.

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“…In solid-state physics, LZ transitions have been used as a beam splitter for manipulating a superconducting qubit with MachZehnder interferometry [20], for coherent control of a qubit system [21], and again as a beam splitter for electronic spin states [22]. They have been used to develop quantum memory in diamond nitrogen-vacancy centers [23].…”

Section: Introductionmentioning

confidence: 99%

Quantum interference in the field ionization of Rydberg atoms

et al. 2015

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We excite ultracold rubidium atoms in a magneto-optical trap to a coherent superposition of the three |m j | sublevels of the 37d 5/2 Rydberg state. After some delay, during which the relative phases of the superposition components can evolve, we apply an electric field pulse to ionize the Rydberg electron and send it to a detector. The electron traverses many avoided crossings in the Stark levels as it ionizes. The net effect of the transitions at these crossings is to mix the amplitudes of the initial superposition into the same final states at ionization. Similar to a Mach-Zehnder interferometer, the three initial superposition components have multiple paths by which they can arrive at ionization and, since the phases of those paths differ, we observe quantum beats as a function of the delay time between excitation and initiation of the ionization pulse. We present a fully quantum-mechanical calculation of the electron's path to ionization and the resulting interference pattern.

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Tunable quantum beam splitters for coherent manipulation of a solid-state tripartite qubit system

Cited by 104 publications

References 25 publications

Amplitude spectroscopy of two coupled qubits

Amplitude spectroscopy of two coupled qubits

Rapid characterization of microscopic two-level systems using Landau-Zener transitions in a superconducting qubit

Quantum interference in the field ionization of Rydberg atoms

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