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Articles by Roman Stricker
Experimental Single-Setting Quantum State Tomography
Abstract Quantum computers solve ever more complex tasks using steadily growing system sizes. Characterizing these quantum systems is vital, yet becoming increasingly challenging. The gold-standard method for this task is quantum state tomography (QST), capable of fully reconstructing a quantum state without prior knowledge.
Characterizing Quantum Instruments: From Nondemolition Measurements to Quantum Error Correction
Abstract In advanced quantum processors, quantum operations are increasingly processed along multiple in-sequence measurements that result in classical data and affect the rest of the computation. Because of the information gain of classical measurements, nonunitary dynamical processes can affect the system, which common quantum channel descriptions fail to describe faithfully.
A universal qudit quantum processor with trapped ions - Nature Physics
Abstract Most quantum computers use binary encoding to store information in qubits—the quantum analogue of classical bits. Yet, the underlying physical hardware consists of information carriers that are not necessarily binary, but typically exhibit a rich multilevel structure. Operating them as qubits artificially restricts their degrees of freedom to two energy levels1.
Demonstration of fault-tolerant universal quantum gate operations - Nature
Abstract Quantum computers can be protected from noise by encoding the logical quantum information redundantly into multiple qubits using error-correcting codes1,2. When manipulating the logical quantum states, it is imperative that errors caused by imperfect operations do not spread uncontrollably through the quantum register. This requires that all operations on the quantum register obey a fault-tolerant circuit design3,4,5, which, in general, increases the complexity of the implementation.
Entangling logical qubits with lattice surgery
Abstract The development of quantum computing architectures from early designs and current noisy devices to fully fledged quantum computers hinges on achieving fault tolerance using quantum error correction1,2,3,4. However, these correction capabilities come with an overhead for performing the necessary fault-tolerant logical operations on logical qubits (qubits that are encoded in ensembles of physical qubits and protected by error-correction codes)5,6,7,8.
Experimental deterministic correction of qubit loss
Abstract The successful operation of quantum computers relies on protecting qubits from decoherence and noise, which—if uncorrected—will lead to erroneous results. Because these errors accumulate during an algorithm, correcting them is a key requirement for large-scale and fault-tolerant quantum information processors.
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