Heralded State Preparation in a Superconducting Qubit

2012/02/29 by J. Johnson, J. E. Johnson, Chris Macklin +7 · 185 citations
Computer Science · Physics and Astronomy · #Charge qubit #Computer science #Fidelity #Flux qubit #High fidelity #Initialization #Phase qubit #Physics #Population #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum mechanics #Qubit #Reset (finance) #Spurious relationship #Superconductivity #cond-mat.mes-hall #cond-mat.supr-con #quant-ph

paper · pdf · doi:10.1103/physrevlett.109.050506

published in Physical Review Letters 109(5), 050506 (American Physical Society) · 5 pages, 5 figures

openalex publication_date 2012/08/03 · arxiv created 2012/08/08 · arxiv updated 2012/08/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We demonstrate high-fidelity, quantum nondemolition, single-shot readout of a superconducting flux qubit in which the pointer state distributions can be resolved to below one part in 1000. In the weak excitation regime, continuous measurement permits the use of heralding to ensure initialization to a fiducial state, such as the ground state. This procedure boosts readout fidelity to 93.9% by suppressing errors due to spurious thermal population. Furthermore, heralding potentially enables a simple, fast qubit reset protocol without changing the system parameters to induce Purcell relaxation.

Citations

• Widely tunable parametric amplifier based on a superconducting quantum interference device array resonator
• Initialization by Measurement of a Superconducting Quantum Bit Circuit
• Fast reset and suppressing spontaneous emission of a superconducting qubit
• Implementing the Quantum von Neumann Architecture with Superconducting Circuits
• Demonstration of two-qubit algorithms with a superconducting quantum processor
• Cavity quantum electrodynamics for superconducting electrical circuits: An architecture for quantum computation
• Strong coupling of a single photon to a superconducting qubit using circuit quantum electrodynamics
• Spectral measurement of the thermal excitation of a superconducting qubit
• High-Fidelity Readout in Circuit Quantum Electrodynamics Using the Jaynes-Cummings Nonlinearity
• Josephson amplifier for qubit readout

Cited by

• Blind Quantum Computation on a Modular Superconducting Processor

Related

• Single-Shot Readout of Macroscopic Quantum Superposition State in a Superconducting Flux Qubit
• Mitigating state transition errors during readout with a synchronized flux pulse
• High-fidelity heralded quantum state preparation and measurement
• Nondestructive Readout for a Superconducting Flux Qubit
• Quantum nondemolition-like fast measurement scheme for a superconducting qubit