Protecting quantum entanglement from leakage and qubit errors via repetitive parity measurements

@article{Bultink2020ProtectingQE,
  title={Protecting quantum entanglement from leakage and qubit errors via repetitive parity measurements},
  author={C. C. Bultink and T. O’Brien and R. Vollmer and N. Muthusubramanian and M. Beekman and M. A. Rol and X. Fu and B. Tarasinski and V. Ostroukh and B. Varbanov and A. Bruno and L. DiCarlo},
  journal={Science Advances},
  year={2020},
  volume={6}
}
We protect two-transmon entanglement from qubit leakage using the same parity checks used to correct standard qubit errors. Protecting quantum information from errors is essential for large-scale quantum computation. Quantum error correction (QEC) encodes information in entangled states of many qubits and performs parity measurements to identify errors without destroying the encoded information. However, traditional QEC cannot handle leakage from the qubit computational space. Leakage affects… Expand
Protecting quantum entanglement by repetitive measurement
TLDR
The theory of quantum error correction (QEC) overcomes complications by encoding quantum information in entangled states of many qubits and performing parity measurements to identify errors in the system without destroying the encoded information. Expand
Entanglement of a pair of quantum emitters under continuous fluorescence measurements
We propose a measurement protocol to generate quantum entanglement between two remote qubits, through joint homodyne detection of their spontaneous emission. The quadrature measurement scheme weExpand
Real-time processing of stabilizer measurements in a bit-flip code
TLDR
This work realizes a classical control architecture for the fast extraction of errors based on multiple cycles of stabilizer measurements and subsequent correction, and demonstrates its application on a minimal bit-flip code with five transmon qubits, showing that real-time decoding and correction is superior in both speed and fidelity to repeated correction based on individual cycles. Expand
Exponential suppression of bit or phase flip errors with repetitive error correction
Realizing the potential of quantum computing will require achieving sufficiently low logical error rates [1]. Many applications call for error rates in the 10−15 regime [2–9], but state-of-the-artExpand
Superconducting Qubits: Current State of Play
TLDR
Several of the recent experimental advances in qubit hardware, gate implementations, readout capabilities, early NISQ algorithm implementations, and quantum error correction using superconducting qubits are discussed. Expand
Rapid and Unconditional Parametric Reset Protocol for Tunable Superconducting Qubits
Qubit initialization is critical for many quantum algorithms and error correction schemes, and extensive efforts have been made to achieve this with high speed and efficiency. Here we experimentallyExpand
High-contrast ZZ interaction using multi-type superconducting qubits
For building a scalable quantum processor with superconducting qubits, the ZZ interaction is of great concert because of relevant for implementing two-qubit gates, and the close contact between gateExpand
Control for Programmable Superconducting Quantum Systems
TLDR
This thesis focuses on the control aspects of building an extensible full-stack quantum computer based on superconducting transmon qubits, and presents a novel tuneup protocol that achieves a tenfold speedup over the state-of-the-art. Expand
Investigating Hammock Networks on IBM Q
TLDR
If and how much hammock networks might help in the quantum realm is tested using simulations on Open image in new window (unfortunately still gate-level constrained), and the preliminary findings are reported in this paper. Expand
A practical guide for building superconducting quantum devices
Quantum computing offers a powerful new paradigm of information processing that has the potential to transform a wide range of industries. In the pursuit of the tantalizing promises of a universalExpand
...
1
2
3
...

References

SHOWING 1-10 OF 69 REFERENCES
Detecting bit-flip errors in a logical qubit using stabilizer measurements
TLDR
This work realizes the two parity measurements comprising the stabilizers of the three-qubit repetition code protecting one logical qubit from physical bit-flip errors, a critical step towards larger codes based on multiple parity measurements. Expand
State preservation by repetitive error detection in a superconducting quantum circuit
TLDR
The protection of classical states from environmental bit-flip errors is reported and the suppression of these errors with increasing system size is demonstrated, motivating further research into the many challenges associated with building a large-scale superconducting quantum computer. Expand
Understanding the effects of leakage in superconducting quantum-error-detection circuits
The majority of quantum error detection and correction protocols assume that the population in a qubit does not leak outside of its computational subspace. For many existing approaches, however, theExpand
Entanglement Stabilization using Parity Detection and Real-Time Feedback in Superconducting Circuits
Fault tolerant quantum computing relies on the ability to detect and correct errors, which in quantum error correction codes is typically achieved by projectively measuring multi-qubit parityExpand
Entanglement stabilization using ancilla-based parity detection and real-time feedback in superconducting circuits
TLDR
The ability to stabilize parity over multiple feedback rounds with no further reduction in fidelity provides strong evidence for the feasibility of executing stabilizer codes on timescales much longer than the intrinsic coherence times of the constituent qubits. Expand
Leakage-resilient approach to fault-tolerant quantum computing with superconducting elements
TLDR
This protocol is based on swap operations between data and ancilla qubits at the end of every cycle, requiring read-out and reset operations on every physical qubit in the system, and thereby preventing persistent leakage errors from occurring. Expand
Deterministic entanglement of superconducting qubits by parity measurement and feedback
TLDR
Here, a time-resolved, continuous parity measurement of two superconducting qubits is performed using the cavity in a three-dimensional circuit quantum electrodynamics architecture and phase-sensitive parametric amplification to produce entanglement by parity measurement reaching 88 per cent fidelity to the closest Bell state. Expand
Extending the lifetime of a quantum bit with error correction in superconducting circuits
TLDR
A QEC system that reaches the break-even point by suppressing the natural errors due to energy loss for a qubit logically encoded in superpositions of Schrödinger-cat states of a superconducting resonator is demonstrated. Expand
Demonstration of a quantum error detection code using a square lattice of four superconducting qubits
TLDR
This work presents a quantum error detection protocol on a two-by-two planar lattice of superconducting qubits that detects an arbitrary quantum error on an encoded two-qubit entangled state via quantum non-demolition parity measurements on another pair of error syndrome qubits. Expand
Detecting arbitrary quantum errors via stabilizer measurements on a sublattice of the surface code
To build a fault-tolerant quantum computer, it is necessary to implement a quantum error correcting code. Such codes rely on the ability to extract information about the quantum error syndrome whileExpand
...
1
2
3
4
5
...