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Universal Unitary Transfer of Continuous-Variable Quantum States into a Few Qubits
Jacob Hastrup1, Kimin Park1,2, Jonatan Bohr Brask1
1Center for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
Physical Review Letters
|April 1, 2022
Summary
We developed a quantum protocol to transfer continuous-variable quantum states to discrete qubits. This method is robust against errors and noise, enabling hybrid quantum systems.
Area of Science:
- Quantum Information Science
- Quantum Computing
Background:
- Continuous-variable (CV) quantum states are essential for quantum information processing.
- Transferring CV states to discrete-variable (DV) qubits is challenging but crucial for hybrid systems.
Purpose of the Study:
- To present a deterministic protocol for transferring arbitrary CV quantum states into a finite number of DV qubits and back.
- To demonstrate the protocol's robustness against errors and noise.
Main Methods:
- Utilizing two-mode Rabi-type interactions, common in trapped-ion and superconducting circuits.
- Implementing a protocol for deterministic state transfer between CV and DV quantum registers.
Main Results:
- The protocol successfully transfers arbitrary CV quantum states into DV qubits.
- Errors from state truncation are suppressed exponentially with the number of qubits.
- Encoded states show robustness against common noise channels like dephasing and amplitude damping.
Conclusions:
- The presented protocol offers a powerful and flexible tool for developing discrete-continuous hybrid quantum systems.
- It facilitates the integration of CV and DV quantum information processing.
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