“…An ac gate voltage is applied to the box through gate capacitance C g as well, and a time-dependent flux threads the ring. Here the microwave drivings are used to induce the desired level transitions 46 , 49 , as mentioned below. Figure 1 Schematic diagram of the considered artificial atom of a Josephson circuit driven by two microwave fields.…”
Section: System and Modelmentioning
confidence: 99%
“…It is found that level anharmonicity in the qutrit is enough, leading to energy spacings ω 32 = ( E 3 − E 2 )/ ℏ and ω 21 = ( E 2 − E 1 )/ ℏ far away from each other. The sufficient anharmonicity can eliminate the leakage errors induced by the coherent drivings, which is highly beneficial for performing robust population transfer with the qutrit 35 , 49 . Figure 2 The first three eigenlevels E j of the CPB system vs the gate charge n d , with j = 1, 2, and 3.…”
We propose an effective scheme to implement fast and robust population transfer with a Josephson qutrit via shortcut to adiabaticity. Facilitated by the level-transition rule, a Λ-configuration resonant interaction can be realized between microwave drivings and the qutrit with sufficient level anharmonicity, from which we perform the reversible population transfers via invariant-based shortcut. Compared with the detuned drivings, the utilized resonant drivings shorten the transfer times significantly. Further analysis of the dependence of transfer time on Rabi couplings is helpful to experimental investigations. Thanks to the accelerated process, transfer operation is highly insensitive to noise effects. Thus the protocol could provide a promising avenue to experimentally perform fast and robust quantum operations on Josephson artificial atoms.
“…An ac gate voltage is applied to the box through gate capacitance C g as well, and a time-dependent flux threads the ring. Here the microwave drivings are used to induce the desired level transitions 46 , 49 , as mentioned below. Figure 1 Schematic diagram of the considered artificial atom of a Josephson circuit driven by two microwave fields.…”
Section: System and Modelmentioning
confidence: 99%
“…It is found that level anharmonicity in the qutrit is enough, leading to energy spacings ω 32 = ( E 3 − E 2 )/ ℏ and ω 21 = ( E 2 − E 1 )/ ℏ far away from each other. The sufficient anharmonicity can eliminate the leakage errors induced by the coherent drivings, which is highly beneficial for performing robust population transfer with the qutrit 35 , 49 . Figure 2 The first three eigenlevels E j of the CPB system vs the gate charge n d , with j = 1, 2, and 3.…”
We propose an effective scheme to implement fast and robust population transfer with a Josephson qutrit via shortcut to adiabaticity. Facilitated by the level-transition rule, a Λ-configuration resonant interaction can be realized between microwave drivings and the qutrit with sufficient level anharmonicity, from which we perform the reversible population transfers via invariant-based shortcut. Compared with the detuned drivings, the utilized resonant drivings shorten the transfer times significantly. Further analysis of the dependence of transfer time on Rabi couplings is helpful to experimental investigations. Thanks to the accelerated process, transfer operation is highly insensitive to noise effects. Thus the protocol could provide a promising avenue to experimentally perform fast and robust quantum operations on Josephson artificial atoms.
“…Ac gate voltages V s a , are applied to the box through gate capacitances C s a , , and a time-dependent flux p F threads the ring. The microwave drivings are used to induce the desired level transitions [5,59], as mentioned below.…”
Section: An Artificial Atom Of a Josephson Quantum Circuitmentioning
confidence: 99%
“…) are far away from each other. Sufficient anharmonicity can eliminate the leakage errors induced by the coherent drivings, which is beneficial for performing robust population transfer with the qutrit [27,59].…”
Section: Jd Cmentioning
confidence: 99%
“…Note that the amplitudes V s and p F are controllable here. Different from previous works that induced level transitions only via voltage drivings[27,59], the present scheme adopts both ac voltage and time-dependent bias flux. Due to the sufficient level anharmonicity, there exists a large detuning s -induced transition between gñ | and eñ | almost vanishing.…”
In this paper, a method to accelerate population transfer by designing nonadiabatic evolution paths is proposed. We apply the method to realize robust and accelerated population transfer with a transmon qutrit. By numerical simulation, we show that this method allows a robust population transfer between the ground states in a Λ system. Moreover, the total pulse area for the population transfer is low as 1.9π that verifies the evolution is accelerated without increasing the pulse intensity. Therefore, the method is easily implementable based on the modern pulse shaper technology and it provides selectable schemes with interesting applications in quantum information processing.
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