A twofold quantum delayed-choice experiment in a superconducting circuit

Liu, Ke; Xu, Yihang; Wang, Wei‐Ting; Zheng, Shi‐Biao; Roy, Tanay; Kundu, Suman; Chand, Madhavi; Vijay, R.; Song, Yipu; Duan, Luming; Sun, Luyan

doi:10.1126/sciadv.1603159

Cited by 42 publications

(32 citation statements)

References 38 publications

(133 reference statements)

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“…The bosonic logical qubit experiment is implemented on a circuit quantum electrodynamics (cQED) architecture [32,33] with a transmon qubit dispersively coupled to two threedimensional (3D) cavities [19,20,22,27,33,34], which is illustrated schematically in Fig. 1a.…”

Section: Arxiv:180509072v1 [Quant-ph] 23 May 2018mentioning

confidence: 99%

Quantum error correction and universal gate set operation on a binomial bosonic logical qubit

et al. 2019

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Logical qubit encoding and quantum error correction (QEC) have been experimentally demonstrated in various physical systems with multiple physical qubits, however, logical operations are challenging due to the necessary nonlocal operations. Alternatively, logical qubits with bosonic-mode-encoding are of particular interest because their QEC protection is hardware efficient, but gate operations on QEC protected logical qubits remain elusive. Here, we experimentally demonstrate full control on a single logical qubit with a binomial bosonic code, including encoding, decoding, repetitive QEC, and high-fidelity (97.0% process fidelity on average) universal quantum gate set on the logical qubit. The protected logical qubit has shown 2.8 times longer lifetime than the uncorrected one. A Ramsey experiment on a protected logical qubit is demonstrated for the first time with two times longer coherence than the unprotected one. Our experiment represents an important step towards fault-tolerant quantum computation based on bosonic encoding.

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Section: Arxiv:180509072v1 [Quant-ph] 23 May 2018mentioning

confidence: 99%

Quantum error correction and universal gate set operation on a binomial bosonic logical qubit

et al. 2019

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“…Similarly, when o = σ − = 0 1 0 0 (S. 40) and H = 0 in Eq. (S.25), the master equation corresponds to a simple Markovian excited state damping channel on a qubit.…”

Section: Qubit Damping Channelmentioning

confidence: 93%

“…1(c)] to assist the unitary operations on the system qubit, e.g., implementing a controlled-phase (CZ) gate and As schematically shown in Fig. 1(d), our experimental device consists of a superconducting transmon qubit dispersively coupled to two waveguide cavity resonators [24,32,[37][38][39][40]. One of the cavities (storage cavity) has long photon coherence times T s 1 = 143 µs and T s 2 = 250 µs, and its |0 and |1 Fock states constitute the two bases of a photonic qubit (the system qubit) on which the QCS are performed.…”

Section: A Principle and Systemmentioning

confidence: 99%

Experimental repetitive quantum channel simulation

Cai

et al. 2018

Science Bulletin

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Universal control of quantum systems is a major goal to be achieved for quantum information processing, which demands thorough understanding of fundamental quantum mechanics and promises applications of quantum technologies. So far, most studies concentrate on ideally isolated quantum systems governed by unitary evolutions, while practical quantum systems are open and described by quantum channels due to their inevitable coupling to environment. Here, we experimentally simulate arbitrary quantum channels for an open quantum system, i.e. a single photonic qubit in a superconducting quantum circuit. The arbitrary channel simulation is achieved with minimum resource of only one ancilla qubit and measurement-based adaptive control. By repetitively implementing the quantum channel simulation, we realize an arbitrary Liouvillian for a continuous evolution of an open quantum system for the first time. Our experiment provides not only a testbed for understanding quantum noise and decoherence, but also a powerful tool for full control of practical open quantum systems.arXiv:1807.07694v1 [quant-ph]

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“…where ρ AR is the joint state of the n + 1 qubits after the controlled-U gate, ∆C(ρ A ) = C(ρ A ) −C(ρ A ) is the coherence consumption during the controlled-U gate, with ρ A and ρ A the states of the ancilla qubit before and after the controlled-U gate, respectively. We realize the DQC1 algorithm using a superconducting transmon qubit dispersively coupled to two waveguide cavity resonators [33,[42][43][44][45], as shown in Fig. 2a.…”

Section: Information Extractionmentioning

confidence: 99%

Witnessing Quantum Resource Conversion within Deterministic Quantum Computation Using One Pure Superconducting Qubit

et al. 2019

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Deterministic quantum computation with one qubit (DQC1) is iconic in highlighting that exponential quantum speedup may be achieved with negligible entanglement. Its discovery catalyzed heated study of general quantum resources, and various conjectures regarding their role in DQC1's performance advantage. Coherence and discord are prominent candidates, respectively characterizing non-classicality within localized and correlated systems. Here we realize DQC1 within a superconducting system, engineered such that the dynamics of coherence and discord can be tracked throughout its execution. We experimentally confirm that DQC1 acts as a resource converter, consuming coherence to generate discord during its operation. Our results highlight superconducting circuits as a promising platform for both realizing DQC1 and related algorithms, and experimentally characterizing resource dynamics within quantum protocols.

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A twofold quantum delayed-choice experiment in a superconducting circuit

Abstract: A twofold delayed-choice experiment was performed, where the behavior of a quantum system was a posteriori chosen twice.

Cited by 42 publications

References 38 publications

Quantum error correction and universal gate set operation on a binomial bosonic logical qubit

Quantum error correction and universal gate set operation on a binomial bosonic logical qubit

Experimental repetitive quantum channel simulation

Witnessing Quantum Resource Conversion within Deterministic Quantum Computation Using One Pure Superconducting Qubit

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