Long-distance photon-mediated and short-distance entangling gates in
three-qubit quantum dot spin systems
- URL: http://arxiv.org/abs/2307.13523v1
- Date: Tue, 25 Jul 2023 14:15:55 GMT
- Title: Long-distance photon-mediated and short-distance entangling gates in
three-qubit quantum dot spin systems
- Authors: Nooshin M. Estakhri, Ada Warren, Sophia E. Economou, Edwin Barnes
- Abstract summary: Superconducting microwave resonator couplers will likely become an essential component in modular semiconductor quantum dot (QD) spin qubit processors.
We focus on a three-qubit system composed of two modules: a two-electron triple QD resonator-coupled to a single-electron double QD.
Using a combination of analytical techniques and numerical results, we derive an effective Hamiltonian that describes the three-qubit logical subspace.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Superconducting microwave resonator couplers will likely become an essential
component in modular semiconductor quantum dot (QD) spin qubit processors, as
they help alleviate cross-talk and wiring issues as the number of qubits
increases. Here, we focus on a three-qubit system composed of two modules: a
two-electron triple QD resonator-coupled to a single-electron double QD. Using
a combination of analytical techniques and numerical results, we derive an
effective Hamiltonian that describes the three-qubit logical subspace and show
that it accurately captures the dynamics of the system. We examine the
performance of short-range and long-range entangling gates, revealing the
effect of a spectator qubit in reducing the gate fidelities in both cases. We
further study the competition between non-adiabatic errors and
spectator-associated errors in short-range operations and quantify their
relative importance across practical parameter ranges for short and long gate
times. We also analyze the impact of charge noise together with residual
coupling to the spectator qubit on inter-module entangling gates and find that
for current experimental settings, leakage errors are the main source of
infidelities in these operations. Our results help pave the way toward
identifying optimal modular QD architectures for quantum information processing
on semiconductor chips.
Related papers
- Lattice Hamiltonians and Stray Interactions Within Quantum Processors [0.6053347262128919]
This study highlights the significance of incorporating the lattice Hamiltonian into quantum circuit design.
By comparing the intensity of three-body versus two-body stray couplings, we identify non-trivial circuit parameter domains that help to enhance fidelity of two-qubit gates.
arXiv Detail & Related papers (2024-02-14T12:52:48Z) - Enhancing Dispersive Readout of Superconducting Qubits Through Dynamic
Control of the Dispersive Shift: Experiment and Theory [47.00474212574662]
A superconducting qubit is coupled to a large-bandwidth readout resonator.
We show a beyond-state-of-the-art two-state-readout error of only 0.25,%$ in 100 ns integration time.
The presented results are expected to further boost the performance of new and existing algorithms and protocols.
arXiv Detail & Related papers (2023-07-15T10:30:10Z) - Generation of perfectly entangled two and three qubits states by
classical random interaction [0.0]
This study examines the possibility of finding perfect entanglers for a Hamiltonian.
In this study, we use a superconducting circuit that stands out from other quantum-computing devices.
Our scheme could contribute to quantum teleportation, quantum communication, and some other areas of quantum information processing.
arXiv Detail & Related papers (2022-12-06T16:27:58Z) - Modelling semiconductor spin qubits and their charge noise environment
for quantum gate fidelity estimation [0.9406493726662083]
The spin of an electron confined in semiconductor quantum dots is a promising candidate for quantum bit (qubit) implementations.
We present here a co-modelling framework for double quantum dot (DQD) devices and their charge noise environment.
We find an inverse correlation between quantum gate errors and quantum dot confinement.
arXiv Detail & Related papers (2022-10-10T10:12:54Z) - 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) - Demonstration of tunable three-body interactions between superconducting
qubits [38.98439939494304]
We present a superconducting circuit architecture in which a coupling module mediates 2-local and 3-local interactions.
The 3-local interaction is coherently tunable over several MHz via the coupler flux biases and can be turned off.
arXiv Detail & Related papers (2022-05-09T20:23:43Z) - Analytical and experimental study of center line miscalibrations in M\o
lmer-S\o rensen gates [51.93099889384597]
We study a systematic perturbative expansion in miscalibrated parameters of the Molmer-Sorensen entangling gate.
We compute the gate evolution operator which allows us to obtain relevant key properties.
We verify the predictions from our model by benchmarking them against measurements in a trapped-ion quantum processor.
arXiv Detail & Related papers (2021-12-10T10:56:16Z) - Strong parametric dispersive shifts in a statically decoupled
multi-qubit cavity QED system [0.4915375958667782]
Cavity quantum electrodynamics (QED) with in-situ tunable interactions is important for developing novel systems for quantum simulation and computing.
Here, we couple two transmon qubits to a lumped-element cavity through a shared dc-SQUID.
We show that by parametrically driving the SQUID with an oscillating flux it is possible to independently tune the interactions between either of the qubits and the cavity dynamically.
arXiv Detail & Related papers (2021-03-16T18:46:57Z) - 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) - 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) - Universal non-adiabatic control of small-gap superconducting qubits [47.187609203210705]
We introduce a superconducting composite qubit formed from two capacitively coupled transmon qubits.
We control this low-frequency CQB using solely baseband pulses, non-adiabatic transitions, and coherent Landau-Zener interference.
This work demonstrates that universal non-adiabatic control of low-frequency qubits is feasible using solely baseband pulses.
arXiv Detail & Related papers (2020-03-29T22:48:34Z)
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.