Rapid and unconditional parametric reset protocol for tunable superconducting qubits

Zhou, Yu; Zhang, Zhenxing; Yin, Zelong; Huai, Sainan; Gu, Xiu; Xu, Xiong; Allcock, Jonathan; Liu, Fuming; Xi, Guanglei; Yu, Qiaonian; Zhang, Hualiang; Zhang, Mengyu; Li, Hekang; Song, Xiaohui; Wang, Zhan; Zheng, Dewen; An, Shuoming; Zheng, Yingkui; Zhang, Shengyu

doi:10.1038/s41467-021-26205-y

Cited by 39 publications

(22 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Motivated by potential quantum computing applications such as improved qubit readout cycle time and fidelity, we choose an experimental setup (Fig. 1 b) consisting of two coupled resonator modes 31 , a and b , with coupling strength J /2 π ≈ 10.5 MHz. Mode b is dispersively coupled to a transmon qubit 32 and mode a is coupled to a feedline at an effective temperature of 75 mK with strength κ a /2 π ≈ 11.4 MHz, which serves as a cold bath.…”

Section: Resultsmentioning

confidence: 99%

Shortcuts to adiabaticity for open systems in circuit quantum electrodynamics

Yin

Allcock

et al. 2022

Nat Commun

Self Cite

View full text Add to dashboard Cite

Shortcuts to adiabaticity are powerful quantum control methods, allowing quick evolution into target states of otherwise slow adiabatic dynamics. Such methods have widespread applications in quantum technologies, and various shortcuts to adiabaticity protocols have been demonstrated in closed systems. However, realizing shortcuts to adiabaticity for open quantum systems has presented a challenge due to the complex controls in existing proposals. Here, we present the experimental demonstration of shortcuts to adiabaticity for open quantum systems, using a superconducting circuit quantum electrodynamics system. By applying a counterdiabatic driving pulse, we reduce the adiabatic evolution time of a single lossy mode from 800 ns to 100 ns. In addition, we propose and implement an optimal control protocol to achieve fast and qubit-unconditional equilibrium of multiple lossy modes. Our results pave the way for precise time-domain control of open quantum systems and have potential applications in designing fast open-system protocols of physical and interdisciplinary interest, such as accelerating bioengineering and chemical reaction dynamics.

show abstract

Section: Resultsmentioning

confidence: 99%

Shortcuts to adiabaticity for open systems in circuit quantum electrodynamics

Yin

Allcock

et al. 2022

Nat Commun

Self Cite

View full text Add to dashboard Cite

show abstract

“…The sum rule (23) states that there are no other losses in the system other than the coherent spontaneous emission into a waveguide. Consider now the solution of equations (17). By subtracting the third equation in (17) from the first one we obtain:…”

Section: The Dynamics Of Three Identical Qubitsmentioning

confidence: 99%

“…Consider now the solution of equations (17). By subtracting the third equation in (17) from the first one we obtain:…”

Section: The Dynamics Of Three Identical Qubitsmentioning

confidence: 99%

“…The equations (51) are nothing but a set of equations (17). Therefore, within a single excitation subspace two Hamiltonians, (1) and (48) are equivalent in that they provide the same equations for the qubits amplitudes.…”

Section: γ = 2πmentioning

confidence: 99%

“…as the frequency detuning between central and edge qubits increases, the decay rates of qubits are also increases. This property is very important for the implementation of the efficient control and readout protocols where a fast reset of the excited qubits to their ground state is essential [17,18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spontaneous decay of artificial atoms in a three-qubit system

Greenberg,

Shtygashev,

Moiseev

2021

Preprint

View full text Add to dashboard Cite

We study the evolution of qubits amplitudes in a one-dimensional chain consisting of three equidistantly spaced noninteracting qubits embedded in an open waveguide. The study is performed in the frame of single-excitation subspace, where the only qubit in the chain is initially excited. We show that the dynamics of qubits amplitudes crucially depend on the value of kd, where k is the wave vector, d is a distance between neighbor qubits. If kd is equal to an integer multiple of π, then the qubits are excited to a stationary level. In this case, it is the dark states which prevent qubits from decaying to zero even though they do not contribute to the output spectrum of photon emission. For other values of kd the excitations of qubits exhibit the damping oscillations which represent the vacuum Rabi oscillations in a three-qubit system. In this case, the output spectrum of photon radiation is determined by a subradiant state which has the lowest decay rate. We also investigated the case with the frequency of a central qubit being different from that of the edge qubits. In this case, the qibits decay rates can be controlled by the frequency detuning between the central and the edge qubits.

show abstract

Recent Developments in Quantum‐Circuit Refrigeration

et al. 2022

View full text Add to dashboard Cite

The recent progress in direct active cooling of the quantum‐electric degrees of freedom in engineered circuits, or quantum‐circuit refrigeration is reviewed. In 2017, the discovery of a quantum‐circuit refrigerator (QCR) based on photon‐assisted tunneling of quasiparticles through normal‐metal–insulator–superconductor junctions inspired a series of experimental studies demonstrating the following main properties: i) the direct‐current (dc) bias voltage of the junction can change the QCR‐induced damping rate of a superconducting microwave resonator by orders of magnitude and give rise to nontrivial Lamb shifts, ii) the damping rate can be controlled in nanosecond time scales, and ii) the dc bias can be replaced by a microwave excitation, the amplitude of which controls the induced damping rate. Theoretically, it is predicted that state‐of‐the‐art superconducting resonators and qubits can be reset with an infidelity lower than 10−4 in tens of nanoseconds using experimentally feasible parameters. A QCR‐equipped resonator has also been demonstrated as an incoherent photon source with an output temperature above 1 K yet operating at millikelvin. This source has been used to calibrate cryogenic amplification chains. In the future, the QCR may be experimentally used to quickly reset superconducting qubits, and hence assist in the great challenge of building a practical quantum computer.

show abstract

Rapid and unconditional parametric reset protocol for tunable superconducting qubits

Cited by 39 publications

References 56 publications

Shortcuts to adiabaticity for open systems in circuit quantum electrodynamics

Shortcuts to adiabaticity for open systems in circuit quantum electrodynamics

Spontaneous decay of artificial atoms in a three-qubit system

Recent Developments in Quantum‐Circuit Refrigeration

Contact Info

Product

Resources

About