The Daily Qubit

☁️ Room Temp Quantum & the Quantum Cloud

Author

Cierra Choucair
April 11, 2024 • Estimated Reading Time: 9 minutes

Welcome to the Quantum Realm. 

Enjoy today’s breakdown of news, research, events & jobs within quantum.

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IN TODAY’S ISSUE:

  • Quantum behavior observed at room temperature, coupled with dynamical multiferroicity

  • Nanobolometers as the latest innovation for scalable and high-fidelity readout of superconducting qubits

  • Huge news for the quantum cloud - first hybrid implementation of verifiable blind quantum computing with minimal photonic loss

  • Plus, extra resources on the quantum cloud

  • AND check out the poll in the “Featured Jobs” section so I can continue molding this newsletter to your needs

TOP NEWS & RESEARCH

NEWS

LASER-LIGHT INDUCED QUANTUM BEHAVIOR AT ROOM TEMPERATURE

The Brief Byte: Researchers from Stockholm University, the Nordic Institute for Theoretical Physics, and Ca’Foscari University of Venice have demonstrated how laser light can induce quantum behavior and magnetism in non-magnetic materials at room temperature, which is a breakthrough for applications in computing and data storage alike.

Highlights:

  1. Quantum technology has largely relied on extremely cold temperatures up until this point. Researchers have demonstrated the creation of magnetic materials from insulators, challenging traditional metal-based methods, and bringing quantum behavior to room temperature.

  2. This breakthrough confirms the theory of “dynamic multiferroicity” which states that when crystal ions spin coherently, they create a magnetic force along the axis of rotation. Their new method uses a light source in the far-infrared to spin atoms and electrons in strontium titanate, creating a magnetic force.

  3. These results have the potential to lead to the development of ultra-fast magnetic switches for more efficient data transfer and storage, not to mention the implications of quantum behavior at room temperature for quantum computing.

RESEARCH

OVERVIEW OF “SINGLE-SHOT READOUT OF A SUPERCONDUCTING QUBIT USING A THERMAL DETECTOR”

The Brief Byte: The study demonstrates a bolometer-based method for high-fidelity, single-shot readout of superconducting qubits at millikelvin temperatures as a scalable alternative to parametric amplifiers.

Highlights:

  1. High-fidelity qubit readout is required for fault-tolerance quantum computing. Superconducting qubits, while promising, experience a high source of errors during the readout phase. Parametric amplifiers are most commonly used to achieve sufficient signal-to-noise ratio for high-fidelity readout, but are difficult to scale. Nanobolometers offer a scalable pathway for readout, and challenge the limitations of parametric amplifiers by utilizing a method that relies on power measurement rather than voltage amplification.

  2. The study is able to demonstrate single-shot qubit readout at a fidelity of 0.618 and a fidelity of 0.927 after error correction. Suggested improvements include using a material with lower heat capacity, removing the additional microwave components, and redoing the chip architecture.

RESEARCH

OVERVIEW OF “VERIFIABLE BLIND QUANTUM COMPUTING WITH TRAPPED IONS AND SINGLE PHOTONS”

The Brief Byte: The study presents the first hybrid implementation of verifiable blind quantum computing, leveraging a trapped-ion quantum server and a client-side photonic detection system interconnected via a fiber-optic quantum link. This demonstrates a scalable approach to secure quantum computing in the cloud.

Highlights:

  1. Access to cloud-based quantum servers will most likely make up a large part of the quantum computing market in the near future, but currently this has not come without privacy, security, and verifiability concerns.

  2. Blind quantum computing can obscure a client's inputs, outputs, and algorithms from the server, ensuring information security and detection of server errors or attacks.

  3. This study demonstrates blind quantum computing using a trapped-ion quantum processor that integrates a 43Ca+ memory qubit with an 88Sr+ single-photon interface to connect to a client photon detection system via optical fiber.

  4. The system ensures near-perfect security and operates under low noise levels overcoming scalability, efficiency, and security hurdles of purely photonic implementations.

MORE BRIEF BYTES

ENTANGLED INSIGHTS

RESEARCH SUPPLEMENT

MORE ON THE QUANTUM CLOUD

EVENTS

FEATURED JOBS

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UNTIL TOMORROW.

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