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Quantum Information Lab
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The lab studies the theory of quantum information, treating quantum entanglement as a resource.
AboutAbout the lab
Exploring information in the quantum world through theory
The Quantum Information Lab conducts theoretical research on quantum information, one of the newest fields in physics.
Quantum information processing uses information represented by quantum-mechanical states to perform tasks that are difficult for classical information processing; proposed examples include quantum computation, quantum cryptography, and quantum communication.
Quantum mechanics has entanglement (quantum entanglement), a nonlocal correlation that does not exist in classical mechanics.
The lab treats entanglement as a "resource" unique to quantum mechanics, aiming to deepen the understanding of quantum mechanics from the new perspective of information and information processing, and to apply it to quantum information processing.
Key terms
- Entanglement
- A state unique to quantum mechanics in which multiple quantum systems are linked and remain strongly correlated even when far apart. Also called quantum entanglement.
- Quantum information processing
- Manipulating information represented by quantum-mechanical states to perform computation and communication that are difficult with classical information processing.
- Higher-order quantum operation
- An operation that takes an unknown quantum operation as input and outputs another quantum operation.
ResearchResearch themes
The lab views a quantum computer not only as a device for performing computation efficiently, but also as a device that can freely perform every operation allowed by quantum mechanics, and theoretically studies the quantum-mechanical effects that arise in it. The lab pursues two approaches in synergy: a basic-science approach that deepens the understanding of quantum mechanics from the viewpoint of information and information processing, and an applied-science approach that puts properties unique to quantum mechanics to use in information processing and communication.
*Illustrative imageQuantum Machine Learning and Quantum Learning
The lab studies methods for performing machine learning efficiently on quantum computers, as well as "quantum learning," which efficiently learns the properties of unknown quantum systems. It develops algorithms that prepare data distributions as quantum superposition states, and quantum neural networks that compute while preserving superposition.
*Illustrative imageDistributed Quantum Information Processing
As the number of qubits grows, it becomes harder to precisely control many qubits within a single quantum computer. The lab analyzes methods for splitting a computation across multiple quantum computers and executing quantum circuits in a distributed manner while minimizing the entanglement required.
*Illustrative imageHigher-Order Quantum Operations
The lab focuses on "higher-order quantum operations," which take an unknown quantum operation given as a black box as input and output a quantum operation. It works on their implementability and implementation algorithms, the resources required for approximation, and applications to analyzing parallelism, causality, and anonymity.
*Illustrative imageProcesses with Indefinite Causal Order
The lab deals with higher-order quantum operations in which the causal order of events is not uniquely determined. It investigates under what conditions such operations can be decomposed into simple operations, and whether the quantum switch, a representative example, can be simulated by quantum circuits with a definite causal order.
MembersFaculty
The members of the Quantum Information Lab consist of faculty, doctoral and master's students, and project researchers.As of 2026
- ProfessorMio MuraoPublications ↗
- Assistant ProfessorSatoshi YoshidaPublications ↗
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RelatedLabs similar to Quantum Information Lab
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Tsuji LabFaculty of Science, Department of PhysicsTheoretical condensed matter physics, with interests in none…The information on this page is compiled by the LabLog team from the lab's public information and interviews. For corrections or removal requests, please contact LabLog, not the lab.
Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Quantum Computer with Dark Background 001” OJB Quantum / CC BY 4.0 (cropped)
- Quantum Machine Learning and Quantum Learning: “T-SNE Embedding of MNIST” Kyle McDonald / CC BY 2.0 (cropped)
- Distributed Quantum Information Processing: “Entangled link - Barb - DARPA Quantum Network - P1010012” Daderot / CC0 (cropped)
- Higher-Order Quantum Operations: “Quantum circuit that exhibits Parity Measurement” Vtomole / CC BY-SA 4.0 (cropped)
- Processes with Indefinite Causal Order: “Six states Bloch sphere” Kevin Garapo, Mhlambululi Mafu, Francesco Petruccione / CC BY-SA 4.0 (cropped)
- Related lab (Ueda Lab): “JILA's strontium optical atomic clock” Sebastian Blatt, JILA, University of Colorado / Public domain (cropped)
- Related lab (Ashida Lab): “Superconducting Metamaterial Chip 002” OJB Quantum / CC BY 4.0 (cropped)
- Related lab (Katsura Lab): “Icosahedrite Diffraction Pattern” Paul Steinhardt / CC BY-SA 4.0 (cropped)
- Related lab (Tsuji Lab): “Cloud of ultracold atoms levitated in a magneto-optical trap” Balping / CC BY-SA 4.0 (cropped)
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