Measurement-free implementations of small-scale surface codes for quantum-dot qubits

@article{Ercan2017MeasurementfreeIO,
  title={Measurement-free implementations of small-scale surface codes for quantum-dot qubits},
  author={H. Ekmel Ercan and Joydip Ghosh and Daniel Crow and Vickram N. Premakumar and Robert Joynt and Mark Friesen and Susan N. Coppersmith},
  journal={Physical Review A},
  year={2017},
  volume={97},
  pages={012318}
}
The performance of quantum error correction schemes depends sensitively on the physical realizations of the qubits and the implementations of various operations. For example, in quantum dot spin qubits, readout is typically much slower than gate operations, and conventional surface code implementations that rely heavily on syndrome measurements could therefore be challenging. However, fast and accurate reset of quantum dot qubits--without readout--can be achieved via tunneling to a reservoir… 

Figures and Tables from this paper

Phase flip code with semiconductor spin qubits

The fault-tolerant operation of logical qubits is an important requirement for realizing a universal quantum computer. Spin qubits based on quantum dots have great potential to be scaled to large

Towards a realistic GaAs-spin qubit device for a classical error-corrected quantum memory

Based on numerically-optimized real-device gates and parameters we study the performance of the phase-flip (repetition) code on a linear array of Gallium Arsenide (GaAs) quantum dots hosting

Quantum Attacks on Bitcoin, and How to Protect Against Them

It is found that the proof-of-work used by Bitcoin is relatively resistant to substantial speedup by quantum computers in the next 10 years, mainly because specialized ASIC miners are extremely fast compared to the estimated clock speed of near-term quantum computers.

Snowmass 2021 of Interest: Insights from Quantum Information Science into Dark Matter Direct Detection Experiments

: Quantum information science has the potential to improve greatly the knowledge about nor-mal matter - dark matter interactions that can be extracted from experiments that perform direct detection

References

SHOWING 1-10 OF 57 REFERENCES

Entanglement and Quantum Error Correction with Superconducting Qubits

A quantum computer will use the properties of quantum physics to solve certain computational problems much faster than otherwise possible. One promising potential implementation is to use

Gate fidelity and coherence of an electron spin in an Si/SiGe quantum dot with micromagnet

It is shown that an electron spin in a silicon/silicon-germanium (Si/SiGe) quantum dot is a good candidate for quantum information processing as well as for a quantum memory, even without isotopic purification.

Surface codes: Towards practical large-scale quantum computation

The concept of the stabilizer, using two qubits, is introduced, and the single-qubit Hadamard, S and T operators are described, completing the set of required gates for a universal quantum computer.

Microscopic quantum dynamics study on the noise threshold of fault-tolerant quantum error correction

A model based on a generalized effective Hamiltonian where the system-environment interactions are taken into account by including stochastic fluctuating terms in the system Hamiltonian enables the effect of noise in quantum circuits under realistic device conditions and avoids strong assumptions such as maximal parallelism and weak storage errors.

Experimental Repetitive Quantum Error Correction

This work implements multiple quantum error correction cycles for phase-flip errors on qubits encoded with trapped ions using a quantum-feedback algorithm using high-fidelity gate operations and a reset technique for the auxiliary qubits.

Optimal control of entangling operations for trapped-ion quantum computing

Optimal control techniques are applied for the decomposition of unitary quantum operations into a sequence of single-qubit gates and entangling operations. To this end, we modify a gradient-ascent

Fault tolerance with noisy and slow measurements and preparation.

This work designs fault-tolerant circuits for the 9-qubit Bacon-Shor code and finds an error threshold for unitary gates and preparation of p((p,g)thresh)=3.76×10(-5) while admitting up to 1/3 error rates for measurements and allocating no constraints on measurement speed.

Quantum computing with realistically noisy devices

  • E. Knill
  • Computer Science, Physics
    Nature
  • 2005
This work reports a simple architecture for fault-tolerant quantum computing, providing evidence that accurate quantum computing is possible for EPGs as high as three per cent, and shows that non-trivial quantum computations at EPG’s of as low as one per cent could be implemented.

Optimized quantum error-correction codes for experiments

In this paper, gauge freedoms in quantum error correction (QEC) codes are identified and strategies for optimal control algorithms to find the gauges which allow the easiest experimental realization are introduced.

Measurement-Free Topological Protection Using Dissipative Feedback

Protecting quantum information from decoherence due to environmental noise is vital for fault-tolerant quantum computation. To this end, standard quantum error correction employs parallel projective
...