Scalable Method for Eliminating Residual $ZZ$ Interaction between
Superconducting Qubits
- URL: http://arxiv.org/abs/2111.13292v3
- Date: Mon, 25 Jul 2022 11:07:21 GMT
- Title: Scalable Method for Eliminating Residual $ZZ$ Interaction between
Superconducting Qubits
- Authors: Zhongchu Ni, Sai Li, Libo Zhang, Ji Chu, Jingjing Niu, Tongxing Yan,
Xiuhao Deng, Ling Hu, Jian Li, Youpeng Zhong, Song Liu, Fei Yan, Yuan Xu and
Dapeng Yu
- Abstract summary: We show a practically approach for complete cancellation of residual $ZZ$ interaction between fixed-frequency transmon qubits.
We verify the cancellation performance by measuring vanishing two-qubit entangling phases and $ZZ$ correlations.
Our method allows independent addressability of each qubit-qubit connection, and is applicable to both nontunable and tunable couplers.
- Score: 14.178204625914194
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Unwanted $ZZ$ interaction is a quantum-mechanical crosstalk phenomenon which
correlates qubit dynamics and is ubiquitous in superconducting qubit systems.
It adversely affects the quality of quantum operations and can be detrimental
in scalable quantum information processing. Here we propose and experimentally
demonstrate a practically extensible approach for complete cancellation of
residual $ZZ$ interaction between fixed-frequency transmon qubits, which are
known for long coherence and simple control. We apply to the intermediate
coupler that connects the qubits a weak microwave drive at a properly chosen
frequency in order to noninvasively induce an ac Stark shift for $ZZ$
cancellation. We verify the cancellation performance by measuring vanishing
two-qubit entangling phases and $ZZ$ correlations. In addition, we implement a
randomized benchmarking experiment to extract the idling gate fidelity which
shows good agreement with the coherence limit, demonstrating the effectiveness
of $ZZ$ cancellation. Our method allows independent addressability of each
qubit-qubit connection, and is applicable to both nontunable and tunable
couplers, promising better compatibility with future large-scale quantum
processors.
Related papers
- On-demand transposition across light-matter interaction regimes in
bosonic cQED [69.65384453064829]
Bosonic cQED employs the light field of high-Q superconducting cavities coupled to non-linear circuit elements.
We present the first experiment to achieve fast switching of the interaction regime without deteriorating the cavity coherence.
Our work opens up a new paradigm to probe the full range of light-matter interaction dynamics within a single platform.
arXiv Detail & Related papers (2023-12-22T13:01:32Z) - Erasure qubits: Overcoming the $T_1$ limit in superconducting circuits [105.54048699217668]
amplitude damping time, $T_phi$, has long stood as the major factor limiting quantum fidelity in superconducting circuits.
We propose a scheme for overcoming the conventional $T_phi$ limit on fidelity by designing qubits in a way that amplitude damping errors can be detected and converted into erasure errors.
arXiv Detail & Related papers (2022-08-10T17:39:21Z) - High fidelity two-qubit gates on fluxoniums using a tunable coupler [47.187609203210705]
Superconducting fluxonium qubits provide a promising alternative to transmons on the path toward large-scale quantum computing.
A major challenge for multi-qubit fluxonium devices is the experimental demonstration of a scalable crosstalk-free multi-qubit architecture.
Here, we present a two-qubit fluxonium-based quantum processor with a tunable coupler element.
arXiv Detail & Related papers (2022-03-30T13:44:52Z) - Suppression of crosstalk in superconducting qubits using dynamical
decoupling [0.0]
Super superconducting quantum processors with interconnected transmon qubits are noisy and prone to various errors.
ZZ-coupling between qubits in fixed frequency transmon architectures is always present and contributes to both coherent and incoherent crosstalk errors.
We propose the use of dynamical decoupling to suppress the crosstalk, and demonstrate the success of this scheme through experiments on several IBM quantum cloud processors.
arXiv Detail & Related papers (2021-08-10T09:16:05Z) - Hardware-Efficient Microwave-Activated Tunable Coupling Between
Superconducting Qubits [0.0]
We realize a tunable $ZZ$ interaction between two transmon qubits with fixed frequencies and fixed coupling.
Because both transmons are driven, it is resilient to microwave crosstalk.
We apply this interaction to implement a controlled phase (CZ) gate with a gate fidelity of $99.43(1)%$ as measured by cycle benchmarking.
arXiv Detail & Related papers (2021-05-12T01:06:08Z) - Suppressing Coherent Two-Qubit Errors via Dynamical Decoupling [20.280283640450723]
We show how to implement dynamical-decoupling techniques to suppress the two-qubit analogue of the dephasing on a superconducting quantum device.
The pure-dephasing time shows an up to 14 times enhancement on average when using robust sequences.
Our study further reveals the decohering processes associated with tunable couplers and establishes a framework to develop gates and sequences robust against two-qubit errors.
arXiv Detail & Related papers (2021-04-06T16:58:42Z) - Arbitrary controlled-phase gate on fluxonium qubits using differential
ac-Stark shifts [1.8568045743509223]
We show a resource-efficient control over the interaction of strongly-anharmonic fluxonium qubits.
Our result demonstrates the advantages of strongly-anharmonic circuits over transmons in designing the next generation of quantum processors.
arXiv Detail & Related papers (2021-03-08T00:02:56Z) - Crosstalk Suppression for Fault-tolerant Quantum Error Correction with
Trapped Ions [62.997667081978825]
We present a study of crosstalk errors in a quantum-computing architecture based on a single string of ions confined by a radio-frequency trap, and manipulated by individually-addressed laser beams.
This type of errors affects spectator qubits that, ideally, should remain unaltered during the application of single- and two-qubit quantum gates addressed at a different set of active qubits.
We microscopically model crosstalk errors from first principles and present a detailed study showing the importance of using a coherent vs incoherent error modelling and, moreover, discuss strategies to actively suppress this crosstalk at the gate level.
arXiv Detail & Related papers (2020-12-21T14:20:40Z) - Probing the coherence of solid-state qubits at avoided crossings [51.805457601192614]
We study the quantum dynamics of paramagnetic defects interacting with a nuclear spin bath at avoided crossings.
The proposed theoretical approach paves the way to designing the coherence properties of spin qubits from first principles.
arXiv Detail & Related papers (2020-10-21T15:37:59Z) - Efficient and robust certification of genuine multipartite entanglement
in noisy quantum error correction circuits [58.720142291102135]
We introduce a conditional witnessing technique to certify genuine multipartite entanglement (GME)
We prove that the detection of entanglement in a linear number of bipartitions by a number of measurements scales linearly, suffices to certify GME.
We apply our method to the noisy readout of stabilizer operators of the distance-three topological color code and its flag-based fault-tolerant version.
arXiv Detail & Related papers (2020-10-06T18:00:07Z) - High-contrast ZZ interaction using superconducting qubits with opposite-sign anharmonicity [15.172882153788267]
We introduce a superconducting architecture using qubits with opposite-sign anharmonicity, a transmon qubit and a C-shunt flux qubit.
We can control the interaction with a high on/off ratio to implement two-qubit CZ gates, or suppress it during two-qubit gate operation using XY interaction.
arXiv Detail & Related papers (2020-02-18T13:53:06Z)
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.