Breaking the trade-off between fast control and long lifetime of a
superconducting qubit
- URL: http://arxiv.org/abs/2002.01635v2
- Date: Mon, 9 Mar 2020 07:24:18 GMT
- Title: Breaking the trade-off between fast control and long lifetime of a
superconducting qubit
- Authors: Shingo Kono, Kazuki Koshino, Dany Lachance-Quirion, Arjan F. Van Loo,
Yutaka Tabuchi, Atsushi Noguchi, Yasunobu Nakamura
- Abstract summary: A second superconducting qubit is strongly coupling along the control line.
This second qubit prevents the qubit from emitting microwave photons and thus suppresses its relaxation.
We observe an improvement of the qubit relaxation time without a reduction of the Rabi frequency.
This device could potentially help in the realization of a large-scale superconducting quantum information processor.
- Score: 0.2770822269241974
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The rapid development in designs and fabrication techniques of
superconducting qubits has helped making coherence times of qubits longer. In
the near future, however, the radiative decay of a qubit into its control line
will be a fundamental limitation, imposing a trade-off between fast control and
long lifetime of the qubit. In this work, we successfully break this trade-off
by strongly coupling another superconducting qubit along the control line. This
second qubit, which we call a Josephson quantum filter (JQF), prevents the
qubit from emitting microwave photons and thus suppresses its relaxation, while
faithfully transmitting large-amplitude control microwave pulses due to the
saturation of the quantum filter, enabling fast qubit control. We observe an
improvement of the qubit relaxation time without a reduction of the Rabi
frequency. This device could potentially help in the realization of a
large-scale superconducting quantum information processor in terms of the
heating of the qubit environments and the crosstalk between qubits.
Related papers
- Fast superconducting qubit control with sub-harmonic drives [1.2402408527122377]
We introduce a new parametric driving scheme to perform single-qubit control.
We achieve rapid gate speed by pumping the transmon's native Kerr term at approximately one third of the qubit's resonant frequency.
We demonstrate pulses as short as tens of nanoseconds with fidelity as high as 99.7%, limited by the modest coherence of our transmon.
arXiv Detail & Related papers (2023-06-16T20:04:27Z) - Mechanically Induced Correlated Errors on Superconducting Qubits with
Relaxation Times Exceeding 0.4 Milliseconds [0.0]
Superconducting qubits are one of the most advanced candidates to realize scalable and fault-tolerant quantum computing.
Here, we realize ultra-coherent superconducting transmon qubits based on niobium capacitor electrodes, with lifetimes exceeding 0.4 ms.
By employing a nearly quantum-limited readout chain based on a Josephson traveling wave amplifier, we are able to simultaneously record bit-flip errors occurring in a multiple-qubit device.
We find that a pulse tube mechanical shock causes nonequilibrium dynamics of the qubits, leading to correlated bit-flip errors as well as transitions outside of the computational state space.
arXiv Detail & Related papers (2023-05-04T06:55:41Z) - Resolving Fock states near the Kerr-free point of a superconducting
resonator [51.03394077656548]
We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Asymmetric Inductive eLement)
We have excited photons near this Kerr-free point and characterized the device using a transmon qubit.
arXiv Detail & Related papers (2022-10-18T09:55:58Z) - Overcoming I/O bottleneck in superconducting quantum computing:
multiplexed qubit control with ultra-low-power, base-temperature cryo-CMOS
multiplexer [40.37334699475035]
Large-scale superconducting quantum computing systems entail high-fidelity control and readout of qubits at millikelvin temperatures.
Cryo-electronics may offer a scalable and versatile solution to overcome this bottleneck.
Here we present an ultra-low power radio-frequency (RF) multiplexing cryo-electronics solution operating below 15 mK.
arXiv Detail & Related papers (2022-09-26T22:38:09Z) - Enhancing the Coherence of Superconducting Quantum Bits with Electric
Fields [62.997667081978825]
We show that qubit coherence can be improved by tuning defects away from the qubit resonance using an applied DC-electric field.
We also discuss how local gate electrodes can be implemented in superconducting quantum processors to enable simultaneous in-situ coherence optimization of individual qubits.
arXiv Detail & Related papers (2022-08-02T16:18:30Z) - Reproducibility and control of superconducting flux qubits [0.0]
Superconducting flux qubits are promising candidates for the physical realization of a scalable quantum processor.
These circuits may have both a small decoherence rate and a large anharmonicity.
We present measurements of a large batch of flux qubits and demonstrate a high level of computation and control of qubit gaps, relaxation times and pure echo dephasing times.
arXiv Detail & Related papers (2022-07-04T14:08:59Z) - High-efficiency microwave-optical quantum transduction based on a cavity
electro-optic superconducting system with long coherence time [52.77024349608834]
Frequency conversion between microwave and optical photons is a key enabling technology to create links between superconducting quantum processors.
We propose a microwave-optical platform based on long-coherence-time superconducting radio-frequency (SRF) cavities.
We show that the fidelity of heralded entanglement generation between two remote quantum systems is enhanced by the low microwave losses.
arXiv Detail & Related papers (2022-06-30T17:57:37Z) - Weakly Flux-Tunable Superconducting Qubit [0.0]
We develop a coherent, flux-tunable, transmon-like qubit with a frequency tunability range as small as 43 MHz.
Such a weakly tunable qubit is useful for avoiding frequency collisions in a large lattice while limiting its susceptibility to flux noise.
arXiv Detail & Related papers (2022-03-08T15:49:48Z) - Slowing down light in a qubit metamaterial [98.00295925462214]
superconducting circuits in the microwave domain still lack such devices.
We demonstrate slowing down electromagnetic waves in a superconducting metamaterial composed of eight qubits coupled to a common waveguide.
Our findings demonstrate high flexibility of superconducting circuits to realize custom band structures.
arXiv Detail & Related papers (2022-02-14T20:55:10Z) - Moving beyond the transmon: Noise-protected superconducting quantum
circuits [55.49561173538925]
superconducting circuits offer opportunities to store and process quantum information with high fidelity.
Noise-protected devices constitute a new class of qubits in which the computational states are largely decoupled from local noise channels.
This Perspective reviews the theoretical principles at the heart of these new qubits, describes recent experiments, and highlights the potential of robust encoding of quantum information in superconducting qubits.
arXiv Detail & Related papers (2021-06-18T18:00:13Z) - Fast high-fidelity single-qubit gates for flip-flop qubits in silicon [68.8204255655161]
flip-flop qubit is encoded in the states with antiparallel donor-bound electron and donor nuclear spins in silicon.
We study the multilevel system that is formed by the interacting electron and nuclear spins.
We propose an optimal control scheme that produces fast and robust single-qubit gates in the presence of low-frequency noise.
arXiv Detail & Related papers (2021-01-27T18:37:30Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.