Adding control to arbitrary unknown quantum operations

Abstract

While quantum computers promise significant advantages, the complexity of quantum algorithms remains a major technological obstacle. We have developed and demonstrated an architecture-independent technique that simplifies adding control qubits to arbitrary quantum operations-a requirement in many quantum algorithms, simulations and metrology. The technique is independent of how the operation is done, does not require knowledge of what the operation is, and largely separates the problems of how to implement a quantum operation in the laboratory and how to add a control. We demonstrate an entanglement-based version in a photonic system, realizing a range of different two-qubit gates with high fidelity.

9 pages, 8 figures

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• Highly Efficient Processing Multi-photon States
• Quantum operations with indefinite time direction
• Experimental Aspects of Indefinite Causal Order in Quantum Mechanics
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• Quantum processing by remote quantum control
• Hamiltonian operator approximation for energy measurement and ground state preparation
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• High Performance Quantum Modular Multipliers
• Reconfigurable controlled two-qubit operation on a quantum photonic chip
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• Modular Quantum Computation in a Trapped Ion System
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• Enhanced Photonic Maxwell's Demon with Correlated Baths
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• Experimental superposition of time directions
• Detecting the degree of macroscopic quantumness using an overlap measurement
• Experimental ancilla-assisted phase-estimation in a noisy channel
• Reassessing the computational advantage of quantum-controlled ordering of gates
• A cold-atoms based processor for deterministic quantum computation with one qubit in intractably large Hilbert spaces
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• Quantum communication through devices with indefinite input-output direction
• Alternation in Quantum Programming: From Superposition of Data to Superposition of Programs
• Ancilla-Error-Transparent Controlled Beam Splitter Gate
• Quantum Recursion and Second Quantisation
• Process fidelity estimation of linear optical quantum CZ gate: A comparative study
• Quantum Generative Adversarial Networks in a Silicon Photonic Chip with Maximum Expressibility
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• General Quantum Bernoulli Factory: Framework Analysis and Experiments
• Assisted quantum simulation of open quantum systems
• Multiple multi-control unitary operations: implementation and applications
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• Generalized Hofmann quantum process fidelity bounds for quantum filters
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• Precision magnetometry exploiting excited state quantum phase transitions
• Learning the structure of any Hamiltonian from minimal assumptions
• Entanglement Meter: Estimation of entanglement with single copy in Interferometer
• Linear optical fan-out gates using fewer ancillary single photons with enhanced success probability
• Witnessing latent time correlations with a single quantum particle