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Path-Independent Quantum Gates with Noisy Ancilla
Wen-Long Ma, Mengzhen Zhang, Yat Wong +5
Ancilla systems are often indispensable to universal control of a nearly isolated quantum system. However, ancilla systems are typically more vulnerable to environmental noise, whi…
An exact correspondence between the quantum Fisher information and the Bures metric
Sisi Zhou, Liang Jiang
The quantum information and the Bures metric are equivalent to each other, except at points where the rank of the density matrix changes. Here we show that by slightly modifying th…
Optimal approximate quantum error correction for quantum metrology
Sisi Zhou, Liang Jiang
For a generic set of Markovian noise models, the estimation precision of a parameter associated with the Hamiltonian is limited by the scaling where is the total p…
Radiative cooling of a superconducting resonator
Mingrui Xu, Xu Han, Chang-Ling Zou +5
Cooling microwave resonators to near the quantum ground state, crucial for their operation in the quantum regime, is typically achieved by direct device refrigeration to a few tens…
Distributed quantum sensing enhanced by continuous-variable error correction
Quntao Zhuang, John Preskill, Liang Jiang
A distributed sensing protocol uses a network of local sensing nodes to estimate a global feature of the network, such as a weighted average of locally detectable parameters. In th…
High-fidelity measurement of qubits encoded in multilevel superconducting circuits
Salvatore S. Elder, Christopher S. Wang, Philip Reinhold +7
Qubit measurements are central to quantum information processing. In the field of superconducting qubits, standard readout techniques are not only limited by the signal-to-noise ra…
Error-corrected gates on an encoded qubit
Philip Reinhold, Serge Rosenblum, Wen-Long Ma +3
To solve classically hard problems, quantum computers need to be resilient to the influence of noise and decoherence. In such a fault-tolerant quantum computer, noise-induced error…
Hardware-efficient quantum random access memory with hybrid quantum acoustic systems
Connor T. Hann, Chang-Ling Zou, Yaxing Zhang +4
Hybrid quantum systems in which acoustic resonators couple to superconducting qubits are promising quantum information platforms. High quality factors and small mode volumes make a…
Photon pair condensation by engineered dissipation
Ze-Pei Cian, Guanyu Zhu, Su-Kuan Chu +4
Dissipation can usually induce detrimental decoherence in a quantum system. However, engineered dissipation can be used to prepare and stabilize coherent quantum many-body states.…
Encoding an oscillator into many oscillators
Kyungjoo Noh, S. M. Girvin, Liang Jiang
An outstanding challenge for quantum information processing using bosonic systems is Gaussian errors such as excitation loss and added thermal noise errors. Thus, bosonic quantum e…
Heralded Generation and Detection of Entangled Microwave--Optical Photon Pairs
Changchun Zhong, Zhixin Wang, Changling Zou +8
Quantum state transfer between microwave and optical frequencies is essential for connecting superconducting quantum circuits to coherent optical systems and extending microwave qu…
Designing good bosonic quantum codes via creating destructive interference
Linshu Li, Dylan J. Young, Victor V. Albert +3
Continuous-variable systems protected by bosonic quantum error-correcting codes have emerged as a promising platform for quantum information processing. To date, design of codeword…
Optimal probes and error-correction schemes in multi-parameter quantum metrology
Wojciech Gorecki, Sisi Zhou, Liang Jiang +1
We derive a necessary and sufficient condition for the possibility of achieving the Heisenberg scaling in general adaptive multi-parameter estimation schemes in presence of Markovi…